Swimming Pool Filters known as sand filtration systems are the most common and simple to use, very acknowledged and have a low maintenance schedule. They use sand and gravel as filter medium. When filters are used to clean pools water, filters work in pressure and the flow is descending (down flow, from the top to the bottom).
These Swimming Pool Filters are used for removal of dust and TSS. These are in different in size as per flow rate and filtration rate. when Delta P (Difference betn. Inlet and Outlet pressure) reached 1.5kg/cm2. It indicate the backwash time.