PSI-021-5RM 5 Stage Re-Mineralizing, Oxygen rich alkalising

This Reverse Osmosis Undersink 5 Stage model PSI-021-5RM is a premium low waste 1 to 1 ratio unit featuring the exclusive membrane flushing with a full size re-mineraliser.

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This is a premium system made from the finest quality parts available without compromise.

This Reverse Osmosis Undersink 5 Stage model PSI-021-5RM is a premium low waste 1 to 1 ratio unit featuring the exclusive membrane flushing with a full size re-mineraliser.

It has the Dow Filmtec 300 litre per day TFC membrane, the 300 litres is rated at 50 psi (350 kpa) but will produce up to 450 litres per day higher pressures, what this means is the system will fill faster than most systems on the market. This system has an auto shut-off device that closes off the in-feed supply when the storage tank has filled.

The re-mineraliser (Alkalizer) which contains crushed Marble and or crushed Limestone, it's primary function is to balance the pH to neutral as reverse osmosis water is slightly acidic because the process removes the calcium from the water which acts as a ph buffer. The material contained in the cartridge is a sedimentary rock which is mostly calcium but also contains trace elements of other minerals.

As reverse osmosis removes not only the good a bad minerals in the water it is advised to add some good minerals back to the water. Health experts say that you obtain the minerals that your body needs from your diet. You should not rely on water as a mineral source as there is very little available to the body in water as the minerals are totally dissolved, the re-mineraliser in this system is about balancing the pH as a taste issue.

Premium systems now have the lowest waste ratio of all systems on the Australian market, using a Patented combination membrane flushing valve/flow restrictor means the waste ratio is about 50% less waste than other brands, waste ratio is now about 1 to 1.

All components are NSF certified to standards 042, 053 & 058

To view the range of optional faucets click here to view


Key Information on the PSI-021-5RM system-


* Main filter unit - 42cm wide, 42cm high and 14cm Deep.

* Storage tanks - Click here for tank details. Tanks can either stand up or lay down

                           4.2L - 33cm high and 20.5cm diameter

                           9L - 39cm high and 24cm diameter

                           12L- 39cm high and 27.5cm diameter


*Jaco & John Guest fittings

*Omnipure and Filmtec filters/membrane

*QMP american Made housings (Australian Standards AS3497 with a burst strength of 575psi (4000kpa),NSF/ANSI standard 042 certification, Watermarked

* Stainless Steel storage tank

* Pressure Limiting valve with dual check valves as per plumbing code requirement- AS1357-2 licence no 23133

* NSF certified Calcite/remineraliser material

Running costs/Maintenance-

*Annual replacement set of cartridges- $65 to be replaced every 12months depending on conditions  Annual change re-order

*Membrane replacement every 4 years - $85 Membrane Re-order

*Remineraliser every 24 months - $20 Remineraliser/Calcite reorder

Click here to download a sample of the installation instructions in pdf format

For membrane treatment rates click here. Removes 98% of Fluoride.

Click here to obtain more information about waste ratios

Mains connect systems; click here to view how each are installed water filter parts

Click here for selection Advice

Substance treatment rates below for TFC reverse osmosis, click here for a full list in PDF.

If you option to have the hand held TDS meter with the unit beware that the system will have an elevated reading due to having the reminerliser cartridge.

All reverse osmosis systems require a minimum pressure of 40 psi (280kpa) with 50 psi (350kpa) or more is ideal. If you are unsure what your pressure is check with your local Council or water authority.

PSI Systems are Better Than Other Brands, click here to find out why

10 year warranty

Product comes complete, ready for installation.

Product Details

Data sheet

10 Years Warranty
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