Reverse Osmosis to Recycle your Pool Water

Reverse Osmosis in Westlake Village , CA

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    Pool Filtering in Westlake Village
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Reverse osmosis now available in Westlake Village


reverse osmosis Westlake Village

Rob's Pool Water Recycling operating the Reverse Osmosis System

Reverse osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove larger particles from water. In reverse osmosis, an applied pressure is used to overcome osmotic pressure, a colligative property, that is driven by chemical potential, a thermodynamic parameter.

Reverse osmosis can remove many types of molecules and ions from solutions, including bacteria, and is used in both industrial processes and the production of potable water. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side.

To be "selective", this membrane should not allow large molecules or ions through the pores (holes), but should allow smaller components of the solution (such as the solvent) to pass freely. In the normal osmosis process, the solvent naturally moves from an area of low solute concentration (high water potential), through a membrane, to an area of high solute concentration (low water potential). The movement of a pure solvent is driven to reduce the free energy of the system by equalizing solute concentrations on each side of a membrane, generating osmotic pressure. Applying an external pressure to reverse the natural flow of pure solvent, thus, is reverse osmosis.


The process is similar to other membrane technology applications. However, key differences are found between reverse osmosis and filtration. The predominant removal mechanism in membrane filtration is straining, or size exclusion, so the process can theoretically achieve perfect exclusion of particles regardless of operational parameters such as influent pressure and concentration. Moreover, reverse osmosis involves a diffusive mechanism, so that separation efficiency is dependent on solute concentration, pressure, and water flux rate. Reverse osmosis is most commonly known for its use in drinking water purification from seawater, removing the salt and other effluent materials from the water molecules.

The Reverse Osmosis Process for Water Filtration, now available in Westlake Village

Osmosis is a natural process. When two liquids with different concentrations of a solute are separated by a semipermeable membrane, the fluid has a tendency to move from low to high solute concentrations for chemical potential equilibrium.

Formally, reverse osmosis is the process of forcing a solvent from a region of high solute concentration through a semipermeable membrane to a region of low solute concentration by applying a pressure in excess of the osmotic pressure. The largest and most important application of reverse osmosis is the separation of pure water from seawater and brackish waters; seawater or brackish water is pressurized against one surface of the membrane, causing transport of salt-depleted water across the membrane and emergence of potable drinking water from the low-pressure side.

Using Reverse Osmosis to Treat Pool Water

Our reverse osmosis equipment installed in our mobile trailer takes the water from your pool and makes it pass under high pressure through a series of membranes that extract all unwanted mineral and organic content. The water is sent back to the pool, in purified state. You can even take a glass and drink it!

We will reutilize 90% of your pool's water, and only 10% of new water from Westlake Village municipal supply has to be added. An additional benefit, reverse osmosis keeps your pool's hydrostatic pressure and prevents cracking from occurring in its structure. Imagine the weight of 20,000 or 40,000 gallons of water pushing the pool's walls against the ground, and then suddenly emptying it and releasing all the pressure of the soil against the walls.

With reverse osmosis, water in a typical size pool is completely renewed between 12 and 24 hours.

The power of reverse osmosis is immense. Watch this colossal project utilizing reverse osmosis to generate 4 million gallons of pure water per hour!


The membranes used for reverse osmosis have a dense layer in the polymer matrix—either the skin of an asymmetric membrane or an interfacially polymerized layer within a thin-film-composite membrane—where the separation occurs. In most cases, the membrane is designed to allow only water to pass through this dense layer, while preventing the passage of solutes (such as salt ions).

This process is best known for its use in desalination (removing the salt and other minerals from sea water to get fresh water), but since the early 1970s, it has also been used to purify fresh water for medical, industrial, and domestic applications. And now it has come to Westlake Village!

What is the Cost of Recycling your Pool Water in Westlake Village?

Estimating is very simple, we just need your pool dimensions to provide a basic quotation. Contact us to get started!

Our BAckground


Rob's Pool Water Recycling brings reverse osmosis pool water filtration to your pool, helping your reduce water consumption by 90%, effectively lowering the utility costs and environmental impact. You now have the tools to help fight the current drought situation in Westlake Village.

With a track record of years servicing Westlake Village and the Santa Barbara, Ventura and Los Angeles counties, we believe in delivering quality work to develop long term relationships with clients, most of which are now, our friends.

What does Reverse Osmosis Remove from Pool Water?

As you know, over time, calcium levels in your pool accumulate, and the water becomes "harder".

Reverse Osmosis is capable of removing up to 99%+ of the dissolved salts (ions), particles, colloids, organics, bacteria and pyrogens from the feed water (although a reverse osmosis should not be relied upon to remove 100% of bacteria and viruses). An reverse osmosis membrane rejects contaminants based on their size and charge. Any contaminant that has a molecular weight greater than 200 is likely rejected by a properly running RO system (for comparison a water molecule has a MW of 18). Likewise, the greater the ionic charge of the contaminant, the more likely it will be unable to pass through the RO membrane.

Reverse Osmosis is very effective in treating brackish, surface and ground water for both large and small flows applications. Some examples of industries that use RO water include pharmaceutical, boiler feed water, food and beverage, metal finishing and semiconductor manufacturing to name a few.

Calcium Removal

Reverse Osmosis Water Filter Systems are a valid option for use in pools and spas. Municipal water contains high levels of calcium and other minerals that cause hardness in water. A small amount of calcium is recommended in pools (150-250 ppm), but once the water in the pool begins to evaporate, the levels of calcium spike dramatically. This causes buildup on the liner, the water line against the tile and in the pool equipment. Calcium becomes very troublesome for owners of swimming pools because it ruins the decorative tile and also causes water chemistry issues.

Chlorine is an important chemical for pools, but calcium absorbs the much needed chlorine. This can force a pool to go out of service. The first instinct is to add more chemicals to balance out this problem, even though doing so can cause more problems and create more work for the homeowner, but using a reverse osmosis water filter system is a much easier and eco-friendly alternative.

Instead of draining the entire pool and then fill it up with the same municipal water containing high levels of calcium, the more viable option is to recycle the pool water, filtering out all the contaminants using a reverse osmosis water filter system. With this method, you can conserve up to 90% of the water that was in the pool.

Using a reverse osmosis water filter system to filter out harsh chemicals such as calcium, salts and other hardness minerals will expand the life and maintenance of the swimming pool equipment. Along with the reverse osmosis membrane, a reverse osmosis water filter is used to help filter out unwanted chemicals. The reverse osmosis water filter helps filter out chemicals such as calcium, cyanuric acid, salts and alkalinity levels in the pool.