If you watch well-known YT channels or read a professional aquarium press, you may come across RO filters and their wide use in the aquarium hobby.
The question is, do You or I need this additional equipment to have a successful fish tank? The answer is not as easy as it seems.
Maybe we start from the beginning.
Reverse osmosis (RO) filter is a water purification equipment that uses a partially permeable membrane to remove ions, unwanted molecules and larger particles from drinking water.
Reverse osmosis filters usually consist of three levels of filtration.
The first stage (L-PS) removes mechanical impurities from the water. Sand, rust and other deposits are retained by micropores, whose diameter decreases towards the interior. Large particles are captured at the surface, while small ones in deeper layers.
The second stage (L-GAC) removes chlorine and organic substances from water, thereby protecting the RO membrane and extending its life. Activated carbon, due to its porous structure, is an excellent filter material. Chemicals are adsorbed in the pores.
The third stage (RO membrane) consists of many layers of semi-permeable, porous membrane. The pores of the membrane are large enough that water can penetrate them but small enough that they do not pass other substances. In this way, microbes and even ions are removed from the water.
People who want full control of their aquarium.
Fish farmers that need the perfect water for fry.
All aquarists that grow a large number of plants. RO helps a lot to maintain perfect proportions of minerals in our aquarium.
Aquarists who have very bad water in their tap.