Reverse osmosis is usually chosen where a standard filter is no longer enough: taste matters, scale in kettles is a problem and deeper polishing is desired. But RO is much more demanding than a simple under-sink filter in terms of space, pressure and maintenance.
What is needed for an RO installation
- Enough space under the sink. Room is needed not only for canisters but also for a storage tank if the system uses one.
- Reasonable water pressure. With low pressure the system works more slowly and less effectively.
- A drain connection. RO sends concentrate to the waste line.
- A dedicated drinking tap. This is usually fitted next to the kitchen mixer.
What is checked before installation
- The real purpose. Is deep purification truly needed, or would a good non-membrane drinking system be enough?
- The existing under-sink layout. The siphon, disposer, dishwasher and hoses often consume most of the space.
- Service access. Membranes and cartridges need real maintenance access later.
- The quality of incoming water. Dirty feed water without pre-filtration shortens membrane life.
What installation includes
- Preparing the feed and drain points.
- Mounting the body and placing the tank.
- Installing the drinking tap.
- Connecting the lines and performing the initial flush.
- Checking operation, tank fill and leak-tightness.
Typical prices in Israel
- Reverse osmosis installation — 930–1,650 ₪
- If the sink or countertop needs drilling for the tap — cost depends on the material and difficulty
- If a booster pump or assembly rework is needed — price rises with the final configuration
Frequently asked
Does everyone need reverse osmosis, or is it overkill?
Not everyone. It makes sense where deeper purification and stable drinking-water taste really matter. In some homes a good non-membrane drinking filter is enough.
Does RO always have a lower flow rate?
At the drinking tap the flow is usually lower than normal cold water. That is typical for these systems, especially without a pump.
Can RO be installed in a very small sink cabinet?
Sometimes, but only after checking the real space. A common mistake is squeezing the system in so tightly that the membrane or cartridges cannot be serviced later.