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.HK120 Hydroponics RO Reverse Osmosis Water System 150GPD Plants Garden

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.HK120 Hydroponics RO Reverse Osmosis Water System 150GPD Plants Garden


KoolerMax Premium RO water system with competitive prices.  Best value

Designed and Made in USA

* We have been making RO systems for 17+ years in Santa Ana California.  Our RO systems are very reliable and guaranteed to perform.

KoomerMax  4-stage 150 GPD Reverse Osmosis Water System for hydroponics (single output)

Model: HK-120 Koolermax series

What is HK-120

  • This is a 4-stage Reverse Osmosis water system that is designed to purify the tap water into ultra pure water for hydroponics
  • It can be used for fresh water aquarium, food processing, spot-free rinse for car wash and window cleaning.
  • 150GPD RO membrane with rejection rate of about 95%, the actual production rate depends on input water pressure, at 85 psi, it will produce about 150GPD, at 60 psi, it makes about 120GPD, at 50psi it makes about 100GPD
  • The production vs. drain ratio is about 1 to 2  at 75psi

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 sediment filter, multi-layer with 20 micron outer layer and 5 micron inner layer which results in higher dirt and sediment holding capacity

5 micron coconut shell carbons provide greater capacity for chlorine and chemical removal rate


example:  input 300ppm --> output 15ppm

If the water supply has TDS (total dissolved solids) reading of 300 ppm, after the 4th stage, the output water will be purified down to 15 to 30 ppm

The 4th stage Reverse Osmosis membrane removes about 90% to 95% of all the minerals in the water supply.



look below part #4, 5, 6

Water supply/feed water adapter:  Now we give you two sizes of water supply adapters,  1/2" MPT and 3/4" garden hose adapter. 

you can use 1/2" adapter for under-the-sink installation and 3/4" hose adapter for garden hose valve or laundry washer hose valve.


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 section of 5 feet each 1/4"

2.  Drain saddle clamp

3.  Filter housing wrench

4.  1/2" MPT feed water adapter

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

6.  garden hose/laundry washer hose adapter (water supply)

7.  tubing insert

8.  on/off ball valve for output


This is a complete system ready to be installed.  It includes all filters, 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, the cost is less than $40 for 4 filters which you replace once a year. You can purchase this filters from us anytime.
  • 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, 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, 1500gallons of water you make)

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, or 1500 gallons of water you make)

4th stage:  TFC-150 Premium membrane we use genuine US MEMBRANE membrane filter, 75-150gal/day, it removes 95%  of all chemical, dissolved solids in tap water. (replace every 2-3 years, about 3000 gallons of water you make)

Dimension:  RO unit, 15" width, 15" height, 5.5" depth

** 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 1:2 (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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