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Everything you need to know about Reserve Osmosis for domestic use

How does reverse osmosis work?

Reverse osmosis uses the mains water pressure to force tap water through a semi permeable membrane. The water is directed across the membrane and passed through the membrane walls. The water that passes through the membrane will not bring the larger impurities with it. The impurities that remain pass into the drain this is how the membrane stays clean.

Why should I choose a Reverse Osmosis Unit?

Reverse Osmosis units use a Thin Film Membrane called a TFC and these will remove between 92 – 98% of all the Total Dissolved Solids in tap water. Some of these include: Bacteria, Chlorine, Copper, Fluoride, Iron, Lead, Manganese, Phosphate, Potassium, Sodium, Sulphate and Zinc.

What is Total Dissolved Solids?

It is the total amount of suspended solids in your tap water called TDS. If you were to take a litre of water and boil it in a pan until the water was all gone and then measure all of the residue left behind this would give you the measurement of milligrams per litre (Mg/L) of impurities. Parts per million (PPM) is the same measurement.

Do you need electricity to operate an RO unit?

No, a domestic RO System runs on the water pressure from the households plumbing.

How does RO water compare to other Drinking Water Systems or Bottled Water?

RO water is preferred for most people, especially over bottled water. As the RO system removes many contaminants this not only makes for safer drinking water, but also greatly improves the taste. The RO process leaves trace amounts of minerals and salts which makes for an overall better taste.

Will RO remove minerals that are healthy?

Tap water varies within each area and water source. Some tap water is heavy in mineral content which can affect the taste and smell of water. Filtering water with an RO system will remove the majority of minerals and greatly improve the aesthetics of drinking water. The minerals in water are in an inorganic state that our bodies cannot digest, removing the minerals does not make RO water unhealthy. So, keep in mind that while minerals are essential for proper health, food is the primary source of the minerals our bodies need to be healthy, and in a form our bodies can digest.

Is a reverse osmosis unit like a distiller?

Both effectively reduce “dissolved solids” content of water, but the processes are quite different. RO filters water through a very tight semi-permeable membrane. A distiller is like a big tea kettle: it boils water, catches the steam, condenses it, and captures the resulting water. Most impurities are left behind in the boiling chamber. Both distillers and reverse osmosis systems rely heavily on carbon filtration for chemical removal.

But isn't distilled water purer than reverse osmosis water?

Distillers typically remove a few parts per million more of common mineral constituents like sodium. However, distillers don't do a good job with volatile chemicals with a low boiling point. Chloramines, for example, which many cities now use instead of chlorine as a disinfectant, aren't removed well by distillers. Reverse osmosis, with the carbon filters that accompany it, does a very good job with chloramines. Unless volatile chemicals like chlorine are removed by carbon filtration before they enter the distiller, they will be released into the room air or they will end up in the distilled water. But in general, distilled water is very pure, as is reverse osmosis water.

Does an RO system waste a lot of water?

It depends on what you mean by waste. A home RO unit uses water to clean itself and wash away impurities. It's like a lot of other water-using appliances. We use water to wash clothes, to wash dishes, to wash cars, to flush toilets.

A reverse osmosis unit uses more water in its operation than you actually consume, but it doesn't use enough that you'll notice it on your water bill. It uses water only while it's filling its storage tank. When the tank is full, the whole unit shuts down and no water runs to drain.

Why are RO systems so popular?

They produce great-tasting, very pure water at a very reasonable cost and in a trouble-free, fully automatic format.

We've found that RO customers are very loyal and the most frequent comment we get is: “We drink so much more water than we used to.”

How often do my filters need replacing?

The filters need to be replaced every 6 months and the Membrane every 1-3 years depending on the incoming feed water quality and water hardness.

What water pressure is needed for the RO system to function?

The RO units require a minimum pressure of 3 bar (40 psi). If you need instructions on how to check your water pressure, please get in touch with us using

What if my water pressure isn’t enough?

Pumps are available on-line to boost mains pressure to work alongside RO units.

Can I install the unit myself or do I need a plumber?

If you are good at DIY you may be able to install the units yourself but we do recommend that a qualified plumber is used.

Do you have a different question? Ask us! Call us on 01704 807600 or email using the 'contact us' page.