Why do you need an RO filter?
Most natural tropical waters have a water hardness of GH 4-5. European water hardness is different from country to country, but there are many places where we have really hard water (GH 15-25 or more).
If you live an area that has hard or very hard water or you are not satisfied with the tap water quality in your area (or you are planning to make a saltwater fish tank), you have the possibility to produce water that has similar composition with that in the tropics or at sea. You are going to use RO filter to do that. The RO abbreviation stands for Reverse Osmosis. This relatively simple technology does not need electricity, it uses the tap water pressure to "squeeze" the H2O (water) molecules through a membrane that will let nothing else through...
https://greenaqua.hu/en/ro-keszulek-hasznalata
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