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Reverse Osmosis / Water Purifier


Reverse Osmosis and Water Purifiers


The term reverse osmosis comes from the process of osmosis, the natural movement of solvent from an area of low solute concentration, through a membrane, to an area of high solute concentration if no external pressure is applied.

In simple terms, reverse osmosis is the process of pushing a solution through a filter that traps the solute on one side and allows the pure solvent to be obtained from the other side. More formally, it is the process of forcing a solvent from a region of high solute concentration through a membrane to a region of low solute concentration by applying a pressure in excess of the osmosis pressure. The membrane here is semipermeable, meaning it allows the passage of solvent but not of solute.

The membranes used for reverse osmosis have no pores, the separation takes place in a dense polymer layer of only microscopic thickness. In most cases the membrane is designed to only allow water to pass through.

When two solutions with different concentrations of a solute are mixed , the total amount of solutes in the two solutions will be equally distributed in the total amount of solvent from the two solutions. This is achieved by diffusion, in which solutes will move from areas of higher concentration to areas of lower concentrations until the concentration in all the different areas of the resulting mixture are the same, a state called equilibrium.

Instead of mixing the two solutions together, they can be put in two compartments where they are separated from each other by a semipermeable membrane. The semipermeable membrane does not allow the solutes to move from one compartment to the other, but allows the solvent to move. Since equilibrium cannot be achieved by the movement of solutes from the compartment with high solute concentration to the one with low solute concentration, it is instead, achieved by the movement of the solvent from areas of low solute concentration to areas of high solute concentration. When the solvent moves away from low concentration areas, it causes these areas to become more concentrated. On the other side, when the solvent moves into areas of high concentration, solute concentration will decrease. This process is termed osmosis. The tendency for solvent to flow through the membrane can be expressed as "osmotic pressure", since it is analogous to flow caused by a pressure diferential.

In reverse osmosis, in a similar setup as that in osmosis, pressure is applied to the compartment with high concentration. In this case, there are two forces to consider influencing the movement of water: the pressure caused by the difference in solute concentration between the two compartments (the osmotic pressure) and the externally applied pressure. In the same way as in conventional osmosis, the solute cannot move from areas of high pressure to areas of low pressure because the membrane is not permeable to it, only the solvent can pass through the membrane. When the effect of the externally applied pressure is greater than that of the concentration difference, net solvent movement will be from areas of high solute concentration to low solute concentration, and reverse osmosis occurs.





Product Image Item Name- Price
2 Stage Countertop Water Filter

2 Stage Countertop Water Filter

2 Stage Water Filter With Faucet Easily removes chlorine, heavy metals and particles from the water Polyspun filter and carbon block filter included...
AU$99.00

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3 Stage Reverse Osmosis 400 L/day

3 Stage Reverse Osmosis 400 L/day

3 Stage Reverse Osmosis 400 LPD  3 Stage Reverse Osmosis   (Standard model)     All components are Australian Standards and NSF...
AU$128.50
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4 Stage RO DI Unit 400 LPD With Dual TDS Meter - Deluxe Premium

4 Stage RO DI Unit 400 LPD With Dual TDS Meter - Deluxe Premium

New 4 Stage Reverse osmosis DI unit with 400 litre per day  The new improved Deluxe premium version includes : * Premium Quality housings. * HM...
AU$310.00
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4 Stage RO SuperDI Unit 200 LPD W/ Dual Pressure Gauge - Premium

4 Stage RO SuperDI Unit 200 LPD W/ Dual Pressure Gauge - Premium

4 Stage Premium Reverse Osmosis with DI Cartridge This is an aquarium reverse osmosis system and is not suitable for drinking water - it is too pure....
AU$205.00
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4 Stage RO SuperDI Unit 400LPD W/ Dual Pressure gauge - Premium

4 Stage RO SuperDI Unit 400LPD W/ Dual Pressure gauge - Premium

  4 Stage Premium Reverse Osmosis water system. Suitable for Aquariums or as a drinking system (requires drinking kit) TFC 400 LPD Premium...
AU$215.00
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4 Stage RO System 200 LPD " Da Boss"

4 Stage RO System 200 LPD " Da Boss"

4 Stage 400 LPD Reverse Osmosis with post DI filter and Dual TDS. Da Boss is back! Featuring : 200LPD @50psi reverse osmosis unit Suitable for...
AU$265.00
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4 Stage RO System 300 LPD " Da Boss"

4 Stage RO System 300 LPD " Da Boss"

4 Stage 300 LPD Reverse Osmosis with post DI filter and Dual TDS. Da Boss is back! Featuring : 300LPD @50psi reverse osmosis unit Suitable for...
AU$270.00
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4 Stage RO System 400 LPD " Da Boss"

4 Stage RO System 400 LPD " Da Boss"

4 Stage 400 LPD Reverse Osmosis with post DI filter and Dual TDS. Da Boss is back! Featuring : 400LPD @50psi reverse osmosis unit Suitable for...
AU$279.50
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4 Stage RODI 400 LPD W/Drinking System

4 Stage RODI 400 LPD W/Drinking System

4 Stage 400LPD Aquarium Reverse Osmosis with DI and Drinking water System all in One This is an aquarium reverse osmosis system and a 2 stage...
AU$239.95
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4G RO PVC Storage Drum

4G RO PVC Storage Drum

12 L PVC Storage drum for Reverse Osmosis / water purifiers systems.
AU$65.00

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6W RO UV Steriliser

6W RO UV Steriliser

UV Steriliser for RO Units Voltage: 240V. 60 Hz UV Light tube included : 6W Size: 50.5 x 260mm In/out diameter: 1/4" NPT Max loading pressure:...
AU$120.00

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Booster Pump

Booster Pump

Booster pump for RO systems 240v power supply included
AU$59.95
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Coralife Pure Flo II Float Valve

Coralife Pure Flo II Float Valve

Coralife Pure Flo II Reverse Osmosis Float ValvePure Flo II R/O Float Valve is part of the Coralife Pure Flo II Reverse Osmosis System. R/O systems...
AU$24.95

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Digital In Line Dual TDS Meter

Digital In Line Dual TDS Meter

HM Digital Dual Tds Meter Displays Highly efficient and accurate due to its advanced microprocessor technology. Auto-Off function conserves battery...
AU$58.50

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Dow Filmtec RO Membrane 200LPD (TW30-1812-50)

Dow Filmtec RO Membrane 200LPD (TW30-1812-50)

Genuine DOW FILMTEC™ reverse osmosis membrane elements for home drinking water are the industry’s most reliable. Advanced membrane technology and...
AU$58.00

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Dow Filmtec RO Membrane 400LPD ( 1812-100)

Dow Filmtec RO Membrane 400LPD ( 1812-100)

Genuine DOW FILMTEC™ reverse osmosis membrane elements for home drinking water are the industry’s most reliable. Advanced membrane technology and...
AU$68.50

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Ion Exchange Resin Beads 500g

Ion Exchange Resin Beads 500g

Premium Ion Exchange Resin Beads suitable for most DI cartridges Can be used in Reverse Osmosis with DI units or standalone in a micron bag
AU$6.00
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Kent Marine Float Valve - Black ABS

Kent Marine Float Valve - Black ABS

All ABS black high density plastic. No metal parts. Will not rust in Saltwater. Rated for City Water Pressure and will mount in sump, hard plastic...
AU$38.50
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Kent Marine Float Valve Kit

Kent Marine Float Valve Kit

The float kit allows an RO to fill a reservoir to a desired level, then shut down water production completely. This kit works from pressure only, no...
AU$108.00

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Kent Marine Maxxima HI-S Deluxe 60GPD

Kent Marine Maxxima HI-S Deluxe 60GPD

4 stage RO/DI unit with liquid filled pressure gauge and clear canisters. These filters will provide the purest water possible. This unit will remove...
AU$840.00
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Kent RO Right 1Kg

Kent RO Right 1Kg

KENT MARINE R/O RIGHT is a concentrated formulation of dissolved solids and balanced electrolytes that returns the natural water chemistry (GH) to...
AU$42.50

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Kleanwater 400LPD 4 stage RO/DI

Kleanwater 400LPD 4 stage RO/DI

The MD Reverse Osmosis/DI 100 GPD Deluxe water purification system is designed for ease-of-use and years of life. These RO Units remove harmful...
AU$286.00

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Matrikx + 10/2 Carbon Replacement Cartridge

Matrikx + 10/2 Carbon Replacement Cartridge

MATRIKX + CTO®/2 filters are the most widely used carbon block devices in the world and provide previously unattainable performance at the lowest...
AU$29.50

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Replacement Carbon Block Cartridge

Replacement Carbon Block Cartridge

Provides high performance at the lowest price ! Removes chlorine taste and odor and organic chemicals that contribute to taste and odor while...
AU$12.00

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Replacement DI Cartridge

Replacement DI Cartridge

Di cartridge  • Designed for deionizing water up to 16 megohms • All materials and construction are FDA-compliant Refillable Cartridge These...
AU$35.00
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