FAQs

FAQs

1. Which filter set should I buy for my system?

Always check the part # on your user manual, and if the part # is not in the user manual, then type your system model # into our search engine. Once the item appears, scroll down to the bottom, and under the Water Filters category, you will find the replacement filters for your system. But if don't know which system or filters you have, please do not call us as our customer support can not help you over the phone, instead upload your system picture so we can figure out your pre and post-filters only but still we don't know the membrane size as you have to pull the membrane out and send us the label number.

2. What is Reverse Osmosis and what types of contaminants does the Reverse Osmosis system remove?

Please click here Reverse Osmosis Systems

3. How can I connect and/or disconnect the tube from a quick type fitting?

4. Adding a booster pump to your existing system?

Please Click Here

Please note that won't cover the power adapter if fails after 15 days of purchase date https://www.maxwaterflow.com/Warranty-Information-_df_36.html . These power adapters are very heavy duty and they won't go bad easily unless was shutting on and of constantly because of the incoming very low pressure / 5 psi and less.

First of all, check the power outlet and if the booster flat plug power strips connecting well to the outlets as this the most common issue our customers face.

Disconnect the low-pressure wires and connect them together and check if the booster pump is running if not disconnect the high-pressure switch wires too and check again and connect the wires and check again.

 

5. What are the replacement filter part numbers for my Home Drinking Standard Reverse Osmosis System?

For 5 stage full replacement filters: 104550 or you can just buy the 3 pre-filters and last stage polishing filter 104504 and membrane 104092

Other options for 75, 100 GPD system, buy 3 pre-filters and last stage polishing filter 104504 and any of the following membranes

75 GPD 104093 ,

100 GPD 104094

For other sizes please click here

Some examples of Max Water 50 GPD Reverse osmosis Systems

Max Water - Filters For Model - 101004 use part number 104550

Max Water - Filters For Model - 101006 use part number 104550

Max Water - Filters For Model - 101007 use part number 104550

Max Water - Filters For Model - 101009 use part number 104550

Max Water - Filters For Model - 101018 use part number 104550

Max Water - Filters For Model - 101032 use part number 104550

Max Water - Filters For Model - 101044 use part number 104550

Max Water - Filters For Model - 101045 use part number 104550

Max Water - Filters For Model - 101110 use part number 104550

Max Water - Filters For Model - 101111 use part number 104550

Max Water - Filters For Model - 101112 use part number 104550

Max Water - Filters For Model - 101122 use part number 104550

Max Water - Filters For Model - 101126 use part number 104550

Max Water - Filters For Model - 101128 use part number 104550

Max Water - Filters For Model - 101124 use part number 104550

Max Water - Filters For Model - 101309 use part number 104550

6. What are the replacement filters for my 6, 7, 8, 9 & 10 Stage Systems?

If your system is 50 GPD, you will need 104550 plus the following: Otherwise, for 75 or 100 GPD and up, you have to go back to Q.3 and purchase your pre-filters and membrane separately.

For 6-Stage alkaline RO systems 101073 or 101074, you need 104550 Plus add filter 104051

For 6-Stage mineral RO systems 101076, you need 104550 Plus add filter 104042

For 6-Stage infrared RO systems, you need 104550 Plus add filter 104044


For 7-Stage Mineral with UV Stainless Steel Housing Light, you need 104550 Plus add filter 104042 Plus [ 105027 UV bulb, for older models, search 105037 or 105024 ] (always check your UV bulb model in your system before purchasing)

For 8-Stage Alkaline Mineral Infrared system part # 101080, system pre and post-filters 104550 Plus add 3-1 Alkaline filter 104180 or 104052


For 9-Stage Alkaline Mineral Infrared DI, you need 104550 Plus add filter 104180 or 104052 Plus 104050

For 9-Stage Alkaline Mineral Infrared with UV Stainless Steel Housing Light System Part # 101086, Or 101038 you need 104550 Plus add filter 104180 or 104052 Plus [ 105027 UV bulb, for older models, search 105037 or 105024 ] (always check your UV bulb model in your system before purchasing)


For a 10-Stage Alkaline System with 5-1 filter system, part # 101190, the 50 GPD system pre and post-filters 104550 Plus add 5-1 Alkaline filter 104185

For 10-Stage Alkaline Mineral Infrared DI with Stainless Steel UV Housing Light System Part # 101089, you need 104550 Plus add filter 104180 or 104052 Plus 104050 Plus [ 105027 UV bulb, for older models, search 105037 or 105024 ] (always check your UV bulb model in your system before purchasing)

For 10-Stage Alkaline Mineral Infrared DI with PVC Casing UV Light System Part # 101088, you need 104550 Plus add filter 104180 or 104052 Plus 104050 Plus [ 105027 UV bulb, for older models search 105037 or 105024 ] (always check your UV bulb model in your system before purchasing)


For 11-Stage Alkaline 5-1 plus DI System, select 104550 Plus add filter 104185 Plus 104050.

For 11-Stage Alkaline 5-1 with Stainless Steel Housing Light System, select 104550 Plus add filter 104185 Plus [ 105027 UV bulb, for older models, search 105037 ] (always check your UV bulb model in your system before purchasing)


For 12-Stage Alkaline 5-1 DI with Stainless Steel Housing Light System, select 104550 Plus add filter 104185 Plus 104050 Plus [ 105027 UV bulb, for older models, search 105037 (always check your UV bulb model in your system before purchasing)


7. What are the replacement filter part numbers for my Portable Reverse Osmosis System?

 

For a 4-Stage Portable system you will need one filter 104040 Plus 2 filters 104041 Plus you need a membrane 104092 for 50 GPD or 75 GPD 104093 or 100 GPD 104094 For other sizes please click here.

For 5-Stage DI Portable system you will need one filter 104040 Plus 2 filters 104041 Plus one filter 104045 (Or for refillable & clear ones 104050 or 104050A ) Plus you need a membrane 104092 for 50 GPD. or 104093 for 75 GPD Systems

For the 5-Stage Alkaline Portable system you will need one filter 104040 Plus 2 filters 104041 Plus one filter 104051 Plus you need a membrane 104092 for 50 GPD.

For the 7-Stage Alkaline Portable system, you will need one filter 104040 Plus 2 filters 104041 Plus one filter 104180 or 104052 Plus you need a membrane 104092 for 50 GPD.

8. What are the replacement filter part numbers for my 5 stage Home Drinking Quick Change Reverse Osmosis System?

First Stage 5 micron Sediment 104061,

Second Stage GAC Carbon filter 104062,

Third Stage either CTO Carbon filter 104063 Or 1 Micron Sediment Filter 104060 (For high chlorine in the water choose CTO. For well water with high sediment, choose 1 Micron).

Fifth Stage polishing filter 104041

Fourth Stage membrane 104092

And For 8-Stage Alkaline Mineral Infrared, add all the 5 above plus add either filter 104180 or 104052 / some new systems supplied with connecting filter part number 104184

9. What are the replacement filter part numbers for my Home Drinking Reverse Osmosis System 101008, 101025L, 101058 & 101084 with a special lager sized filter?

5 stage full replacement filters 104505 and membrane 104092

Some examples of Max Water 50 GPD Reverse osmosis Systems

Max Water - Filters For Model - 101008 use part number 104505

Max Water - Filters For Model - 101058 use part number 104505

10. What are the replacement filter part numbers for my Aquarium Reverse Osmosis System?

4 stage - The first three pre-filters 104515 + 1 Membrane if 50GPD 104092 , but if its 75 GPD 104093, and for 100 GPD 104094

5 stage - The first three pre-filters 104515 + 1 Membrane ( any of the above 50, 75, or 100 GPD) + Deionization filter 104045 or for the refillable type you can select 104050 or 104050A or just buy DI media Bag for Aquarium 104138-2 or for drinking 104135-2 to refill your refillable filters

6 stage - same 5th stage filter just either add another Deionization filter ( repeat stage 5 ) 104045, 104050, 104050A or refill media Aquarium 104138-2 or for drinking 104135-2 or add Carbon filter for some other system if carbon is required 104041 like the Dual systems ( Drinking + Aquarium)

11. What are the replacement filter for my 10" x 2.5" Whole house System?

Ø 2 stage ( Sediment 5 Micron + CTO Carbon Block) item # 104002 and 104005

Ø 2 stage ( Sediment 5 Micron + GAC Carbon Block) item # 104002 and 104004

Ø 3 stage ( Sediment 5 Micron + GAC Carbon + CTO Carbon Block) item # 104516

Ø 3 stage ( Pleated 5 Micron + Sediment 5 Micron +GAC Carbon) item # 104513

Ø 3 stage ( Sediment 5 Micron + Iron Manganese + CTO Carbon Block) item # 104002 plus 104321 and 104005

Ø 3 stage ( Sediment 5 Micron + Cation Resin + GAC Carbon) item # 104002 plus 104022 and 104004

You can find other filter combinations on the following link Water Filters : 10" X 4.5" Filters

12. What are the replacement filters for my 10" x 4.5" Whole House System?

Ø 2 stage ( Sediment 5 Micron + CTO Carbon Block) item # 104102 and 104104

Ø 2 stage ( Sediment 5 Micron + GAC Carbon Block) item # 104102 and 104103

Ø 3 stage ( Pleated 5 Micron + Sediment 5 Micron +GAC Carbon) item #104595

You can find other filter combinations on the following link Water Filters : 10" X 2.5" Filters

13. What are the replacement filters for my 20" x 2.5" Whole House System?

Ø 3 stage ( Sediment 5 Micron 104081 + GAC Carbon 104082 + CTO Carbon Block 104083)

You can find other filter combinations on the following link Water Filters: 20" X 2.5" Filters

14. What are the replacement filters for my 20" x 4.5" Whole House System?

Ø 2 stage ( Sediment 5 Micron + CTO Carbon Block) item # 104586

Ø 2 stage ( Sediment 5 Micron + GAC Carbon Block) item # 104580

Ø 3 stage ( Sediment 5 Micron + GAC Carbon + CTO Carbon Block) item # 104592

Ø 3 stage ( Pleated 5 Micron + Sediment 5 Micron +GAC Carbon) item # 104590

Ø 3 stage ( Sediment 5 Micron + Iron Manganese + CTO Carbon Block) item # 104112 Plus 104121 and 104114

You can find other filter combinations on the following link Water Filters: 20" X 4.5" Filters

15. How do you change your whole house pressure gauges.

If you would like to install or exchange the old gauges with new pressure gauges, please remove all the old Teflon tape from the pressure gauges and apply 4-5 rounds of Teflon tape in the clockwise direction. Please make sure the Teflon is not applied loosely otherwise leaking may occur. To install the pressure gauges onto the system, DO NOT turn the pressure gauges from the head otherwise you may cause damage. Instead, use a suitable wrench at the base of the pressure gauge and turn the pressure gauges clockwise 360 degrees about 4-5 times maximum otherwise you will damage/ crack the housing gauge hole.

16. Why Does the Water From My Reverse Osmosis System Seems Cloudy or Milky?

The water out of my Reverse Osmosis system looks milky or cloudy, what is the reason behind this issue?

This is generally caused by trapped air within the RO system. However, it will not affect the quality of your water. The cloudiness should disappear within a minute after water sits in a glass. This is a normal occurrence with a newly installed RO System or after a filter change. You can release the air from your RO system by draining the tank 1 to 2 more times or using RO to make humming noise air release instructions in your system manual (see below).

Instructions to Release Air Trapped in Check Valve:

If your RO system makes a whining or humming noise, most likely it’s due to air that got trapped in the “Check Valve” during installation. So we need to get rid of the air in the Check Valve.

The Check valve is on the left side of the Membrane Housing. It is an internal valve encased in the L-shaped plastic fitting. It connects to the Clear line that puts out pure water from the Membrane housing.

To relieve the air bubbles, do as follows: (See Pictures Below)

Step 1: Close the Tank’s valve.

Step 2: Tilt the RO system to the right. Put something under the 3rd filter housing to keep RO tilted. This will help dislodge the air bubbles from the Check Valve.

Step 3: Turn on the RO spigot. Let pure water flow thru the spigot for about 1 minute. This forces the air to flow directly out to the spigot, bypassing the tank.

Step 4: Turn off the spigot. Wait for about 10 seconds. Repeat step 3 again. Perform this step around 3- 4 times.

17. How to Replace the O-Rings in a Quick Connect Fitting

These instructions for repairing quick connect fitting such for John Guest fitting

Turn off the incoming feedwater inlet line and open a faucet downstream of the unit to relieve the system's internal pressure and also close the valve on top of the storage tank.

Remove the tube from the fitting by pressing inward on the collet and simultaneously pulling the tube out of the fitting.

Remove the collet from the fitting. Just grasp it with your fingernails and pull it out.

Use a thin-bladed screwdriver, a toothpick, tweezers, or some other thin tool to pull the o-ring out of the fitting. Be careful not to damage the fitting, but don’t worry about the o-ring. You're going to throw it away.

Put the new o-ring into the fitting and push it into position with the end of the tube itself. (Don't use a sharp tool that could damage the new o-ring.) The o-ring should be pushed in so that it stands against the back wall of the fitting.

When the o-ring is in place, reinstall the collet by simply pushing it back into the fitting. If the o-ring is slightly out of position, inserting the collet should fix it. You normally won't need to replace the collet, but it doesn't hurt.

18. Where should I go to test my water sample?

Please click on this link to show you all Ontario licensed laboratories

19. I am getting weird sounds from my RO system?

usually, the sound presents for may reason. High pressure, low pressure, and auto shut failer after 5 years.

* Hi, pressure more than 75 psi, add pressure reducer. Part #105229

*Low pressure less than 50 PSI check city water incoming pressure to the system membrane housing inlet. if it's less than 50 PSI check the pre-filters as they might be clogged with dirt. The pressure is well and more than 50 PSI check the membrane if it's more than 2 years replace it. if all above is good and city water is less than 50 PSI then you have to add a booster pump to increase the pressure by more than 60 PSI

* check the flow restrictor if partially blocked with the dirt during the use by Appling water pressure from the opposite side.

if all above is good then change the auto shut-off valve. Search item # 105111

20. Adding Air to the Reverse Osmosis Storage tank?

When water stops running out from the faucet; check the tank weight, if it's more than 10 Lbs, that means that the tank air pressure is down. Use a bicycle manual pump and start adding air and the entire process takes about 10 to 15 minutes to fill the tank at its optimal PSI (6 - 7 PSI ) while the tank water bladder is completely empty. Make sure to not add air ( in all tanks at once) because that will damage the air bladder. When pumping air to the tank, only make 2 pumps at a time and wait until the tank releases water out from the topwater threaded valve, once the water stops make proceed to make another 2 pumps and repeat the cycle until all the water comes out of the tank and then check what's the air pressure, it has to be between 6 to 7 PSI max with no more water coming out.

We ( Max Water ) are not responsible for any damage that occurred by the user during the above process.

21. My RO system is not producing enough water or the tank is not filling.

It could be any of the following:

Check your tank pressure, please follow step # 20 above.

Check your pre-filters quality, if the sediment filter is clogged with dirt, the entire system pressure will drop and the feeding pressure to the membrane housing will be less than the minimum requirement and all the feeding water will divert to the waste side, the tank never fills and your waste line will keep running.

The last time your membrane was installed/replaced: If your membrane is older than 2 years or if your incoming water PPM is higher than 400 PPM, there is a high possibility that your membrane is clogged and you either try to flush it or change it. Flush the membrane by bypassing the flow restrictor, letting the water free flow for 5 to 10 minutes. If your membrane is older than 2 years, please replace it.

Check your system flow restrictor and the Auto shut-off valve(ASV), usually, these two valves are good for 3 to 7 years, but sometimes the ASV becomes faulty if your incoming water is higher than 80 PSI, or if the incoming water is less than 50 PSI. The system cannot produce water if the pressure drops below 45 PSI (usually this happens when you buy a system; it works fine for 2 months, then the problem starts) after the sediment filter starts clogging with dirt and the pressure drop to 45 PSI, the system will not produce water and the production will direct the waste.


22. I purchased a whole house filter set and installed it, but then my flow rate dropped?

First, make sure that you install the filters in the right flow direction (ie. if your system flow is Right to Left, make sure to install the Sediment filter first, GAC second, and CTO last.) or also (SED first, Iron Manganese second, then CTO last).

Installing the filter in the opposite direction will force the water to flow from the middle of the Sediment filter to the outside, causing pressure drop and filter clogging.

Second, make sure you install the GAC and Iron filter in the right vertical direction (Center Hole on top). If you install these filters upside down, your filter will restrict flow to pass, and also might damage the filters.

Third, when you install the GAC filter in the first stage or any type of UDF filter, the filter inlet membrane surface flow is very limited, and this membrane can get clogged within a couple of hours or days and cause a huge pressure drop.

Make sure to feed the system with the right pressure (ideal is 60 PSI) anything lower like 30 PSI will not let the filters perform as intended, but also higher pressure might damage the filter (especially the GAC filter).

We ( Max Water ) are not responsible for any failure of damage that occurred to any type of replacement filters, for more detail please Click Here


23. I purchased an Iron Manganese System but the water is red in color and my CTO got covered in Iron Fines. How do I get my system to work properly?

Installing the system immediately with all 3 Filters loaded in will cause the CTO / 3rd Stage filter to be covered with iron fines, so when handling Iron Manganese systems, pre-preparation for the system is very important. (Note that only our 10"x2.5" Iron Manganese Filter can function as part of a 1-stage system)


For the first time use of the filters, load the sediment filter into the 1st stage housing (right), and load the iron-manganese filter in the 2nd stage housing (middle). Leave the CTO Filter out and leave the 3rd stage housing (left) empty. Connect the system to your house and open the mainline, opening the nearest faucet to flush out the residue of red finery, and leave it running for as long as the red color in the water remains. Once the water coming out of the faucet is clear without a reddish color, your System is ready for the CTO Filter to be installed into the 3rd Stage Filter Housing. Stop the mainline, install the CTO Filter, and open the mainline again.

We ( Max Water ) are not responsible for any failure of damage that occurred to any type of replacement filters, for more detail please Click Here

24. I purchased some new filters / filter housings but when I assemble my system there is massive pressure drops and water has trouble flowing. What's the possible cause of this?

This may be a compatibility issue between your Filter(s) and the Filter Housing Head(s) of your system, which can be for many reasons. The filter housing head is meant to sit on the filter, and there is a hole in the center of the Filter Housing Head that allows water exiting the filter to pass through.

The standard Filter Housing Head has a Hole with a SHORT stem, but other manufacturers can also supply Filter Housing Heads that have a Hole with a LONG stem.

Some Filters have an opening at the top that keeps the center and sides of the hole completely exposed. Other Filters will have the center of its hole covered, with small openings on the sides of the hole.

 

  • One reason for the pressure drop is if by chance you have a Filter Housing Head with a LONG hole stem, and combine that with a Filter that has a covered center hole, the LONG stem's Hole will be completely covered by the Filter's hole covering. This is the main source of pressure drop and flow restriction. There is no opening for the water to flow. One Possible Solution (perform at your own discretion) is drilling 1-2 small holes into the sides of the LONG stem hole, which permits the water coming from the sides of the Filter's hole to flow through the sides of the Head's LONG stem, allowing for proper water flow and barely any pressure drop.
  • A second reason could be if the system's filters were placed in the wrong order, which can cause serious problems. A Sediment Filter will always be the first stage in any system because it can catch the larger sediment particles while it lets the 2nd stage filter and onwards only deal with the microscopic particles. If for instance, a GAC or Iron Filter was placed as the first stage in a system, the larger particles in the unfiltered water cannot be dealt with by these filters' extremely thin sediment membrane, causing the filter to quickly become clogged, and the pressure to drop rapidly. The sediment filter must always come first in multi-stage systems to protect your other filters and the rest of your system from getting clogged and potentially damaged.

 

We ( Max Water ) are not responsible for any failure of damage that occurred to any type of replacement filters, for more detail please Click Here

25. What’s the Difference Between POU and POE Water Filtration Systems?

Point-of-Use (POU)

POU systems filter your incoming water right where you use it. That could be an individual tap, faucet or shower. POU systems encompass filters that connect to a water line under the sink, filters that attach to your faucet, and even filtration pitchers you fill with water.

Point-of-Entry (POE)

POE water filtration systems are also known as “whole home” systems because they filter all the water that comes into your home or business. These systems attach to the mainline where water enters your home and filter all of it before it reaches any sinks or showers.

26. How do I correctly apply Teflon Tape to threading?

Please click here Teflon Wrapping Directions

27. Why did my filter housing(s) crack?

There are at least 3 reasons why your filter housing can crack:

  • The environment the system was set up in is too cold causing the water circulating through the system to freeze and crack the housing.
  • The pressure in the system is too much, causing cracks. This is due to customer error as Max Water provides in the system description the threshold of pressure the system can withstand.
  • The Housings were twisted open/closed without a housing wrench, or other forms of user mishandling.
Warranties are not applicable to filter housing cracks. See Warranty Information for details.

 

28. How do I convert my aquarium system into a drinking system?

 

  • First, you have to remove your DI Filter.
  • Make sure the system should include a check valve part number 105116 and auto shut off valve part number 105111
  • add 4.4 Gallon Standard Size Reverse Osmosis Storage PAE Tank RO-132: Part Number: 105006 plus Tank Ball Valve part number 105137
  • add 10" x 2" T33 GAC Inline Coconut Shell Carbon Filter, Part Number: 104041 ( two fittings should be available in your system part number 105407 and part number 105429) plus you should have a faucet and 1/4 inch tube
So your stages of filtration will be as follows:
  • 1st Stage: 5 Micron Polypropylene Sediment Filter 104002
  • 2nd Stage: Granular Activated Carbon (GAC) Filter 104004
  • 3rd Stage: 5 Micron Carbon Block (CTO) Filter 104005
  • 4th Stage: RO Membrane
  • 5th Stage: Inline T33 GAC Coconut Shell Carbon Filter 104041

 

We ( Max Water ) are not responsible for any damage that occurred by the user during the above process.

29. Why is a Sediment Filter required before the Iron Manganese Filter?

In most cases with Iron Content in the water, the water itself will usually contain different types of contaminants/sediments/dirt, etc. When your water filter stops passing water, it's incorrect to believe that only Iron content is the cause. The inlet woven filter on the Iron Manganese Filter will be clogged with dirt or sediment.

The Iron Manganese Filter is ultimately specialized in filtering out Iron Manganese content but is minimally equipped to deal with tiny amounts of Sediment and Dirt. Since Iron Water will often have large amounts of dirt and sediment, a Sediment Pre-Filter is REQUIRED if the Iron Filter following it, or any filter following the Sediment Filter for that matter, are to properly work as intended without clogging up too early.


 

30. Why is my membrane fouling or clogging fast within 4 to 8 months?

    We believe that the reasons for the problem may be the following:

  • 1) Due to the feed water is from well water, The hardness may be too high. Caused fouling of membrane elements and reduced salt rejection.
  • 2) Iron is present in water. When the iron ion content of influent water is less than 0.05PPM, strong acid cation resin can be used for adsorption. When the iron ion content is 0.05-2 PPM, the iron-manganese sand filter can be used for filtration. The manganese sand filtercan be used for filtration, if no sediment filter is included; it is better to buy the 3 stages iron out systems to prolong the iron filter life. The manganese sand filter can oxidize Fe2+ and filter at the same time. which can effectively prevent iron pollution from reverse osmosis. some times using 1% Na2S2O4 at temperature < 30°C, PH 4-6 /but in general iron fouling is very difficult to clean.
  • 3) There is a problem with the brine seal.
  • 4) Oxidizing substances in the feed water, Cause the membrane element to be oxidized.
  • 5)System recovery is too high.
  • Due to system design problems, membrane elements need to be replaced every six months.

    We suggest our ULP-4040MR-2 with high well water PPMs, Salt rejection will be better, But the membrane life will not be significantly improved if there is a system design problem.

    For fouling membranes, we recommend using part # 104190 liquid antiscalant and dispersant formulated to inhibit scale and disperse colloidal particles in cellulose acetate and polyamide reverse osmosis.

So your stages of filtration will be as follows: