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Premium RO water system with competitive prices.  Best value

Designed and Made in USA

Koolermax series 6-stage Alkaline Reverse Osmosis Water System for home drinking water

Model: K-6A  Alkaline

What is K-6A

  • This is a 6-stage Alkaline Reverse Osmosis water system that is installed under the sink for drinking water.  It is designed to purify the tap water into clean and good tasting water, also the 5th stage Alkaline filter adds small amount of Calcium and Magnesium to make the water alkaline.
  • The pH level coming from the system is about 8.5 to 9.5,  if you want to get higher pH, please specify, we are able to provide 10.5 pH system.

Alkaline water means the pH of the water is above 8.0

Neutral water has a pH of 7.0 to 7.9

Acidic water has a pH of below 7.0

After extensive research, testing, and collaboration with component manufacturers, we have come up with this U.S. Patented designed that is packed with improvement and enhancement.

This new RO system is loaded with upgraded components to improve its function and capability.  It performs better than any typical RO system in its class.

The improvements are:

Bonus pressure gauge is installed in the system:  The pressure gauge is installed on the bracket after stage 3 to monitor the operating pressure.  When the system is making water, it indicates the operating pressure.  When you see a pressure drop of 15 psi, that means the filters are clogging up, need replacement.


5 micron muti-layer sediment filter with outer layer 20micron and inner layer 5 micron for greater sediment holding capacity

5 micron coconut shell carbon for better chlorine and chemical reduction


Upgraded faucet are now standard:  The stylish dispensing faucet with ceramic disc shut-off are now standard.  It is a lead-free faucet.  This upgrade ensures the longevity of its function and enhancement of aesthetic.

Water supply/feed water adapter:  Now we give you two sizes of water supply adapters,  1/2" MPT and 3/8" compression.  Since newer plumbing under the sink and newer kitchen faucets are using 3/8" compression fitting, we now also include a brass type 3/8" compression adapter.


Clear housing for the first stage sediment filter:  Using the clear housing is an easy way to tell if the first stage sediment filter is getting dirty or clogging up.


New design of auto-shut-off valve:  It looks the same outside but it's new seal design provides more accurate shut-off and higher shut-off pressure. 


Parts bag:

1.  Color tubing, 4 sections of 5 feet tubing 1/4" OD

2.  Drain saddle clamp

3.  Bottom filter housing wrench and Membrane filter housing wrench

4.  1/2" MPT feed water adapter

5.  Inline ball valve, on/off for water supply

6.  Brass type 3/8" compression fee water adapter

7.  Tubing insert

8.  Tank ball valve, on/off ball valve for output

9.  Male elbow fitting, 1/4"MPT, 1/4" tubing, compression type


This is a complete system ready to be installed.  It includes all filters, storage tank, faucet, tubing, installation hardware, installation manual. 

  • The system come with high capacity filters, you only need to replace the pre-filters and post filter once a year instead of every 6 months.
  • We offer one year limited warranty for parts and components.
  • We also guarantee the performance of the RO systems
  • Local pickup NOT available
  • Free Tech support
  • We carry all parts and components
  • This is a complete system with all filters, storage tank, faucet, tubing, feed water adapter, drain saddle valve, installation manual.  Ready for installation.

1st stage:  high capacity 5 micron sediment filter, to remove sediment, rust, sand, (replace every 6 - 12 months)

2nd stage:  high capacity carbon filter, coconut shell carbon block filter removes chlorine, taste, & chlorine (replace every  6 - 12 months)

3rd stage:  high capacity carbon filter, coconut shell carbon block filter further removing chlorine to ensure 100% removal of chlorine (replace every  6 - 12 months)

4th stage:  TFC-75 Premium membrane we use genuine US MEMBRANE membrane filter, 75-85 gal/day, it removes 95% to 98% of all chemical, dissolved solids in tap water. (replace every 2-3 years)

5th stage:  Alkaline filter, a mix of Calcium and Magnesium to make water alkaline, (change every 12 to 18 months)

6th stage:  high capacity final stage inline carbon filter, granular activated carbon, to improve taste of water. (replace every 12 months)


Dimension:  RO unit, 16" width, 18" height, 5.5" depth;  pressure tank, about 10" diameter 15" height

** Important Note:

All reverse osmosis systems, residential or commercial, are required to have drain water when making pure water.  Our RO systems have built-in auto-shut-off valve so when the storage tank is full, the system shuts off automatically.  The ratio of pure water to drain water for our RO systems are 1:3 (calculated).  Average RO systems are typically 1:4, so our RO systems run more efficiently.  Minimum water pressure required to operate the system is 45 PSI. Ideal pressure is 85 PSI.

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