Tank filter 3 stages for water purification There is inside the three cartridges The first stage is an initial candle composed of cellulose fibers (with a precision of 5 microns) that blocks impurities, sand, dirt, insects and rust fibers and is changed every three months. The second stage is a compact candle consisting of a membrane with a precision of 1 micron to confirm There are no impurities in the water, and inside it is a solid carbon plate to absorb chlorine and its derivatives and organic materials and are changed every six months. The third stage is an active carbon candle that confirms the removal of excess chlorine in the water and its derivatives, organic materials, gases and algae and is changed every six months. It comes with a one-year warranty. Tank Company