Superior filtration from the inside out. The series pool filter with pump features an integral top diffuser that evenly distributes unfiltered water over the sand media bed in a cascading, umbrella-like pattern.   This allows the greatest filtration possible from every square inch of sand. Then the self-cleaning under-drain assembly, with its 360 degree slotted laterals, provides a fast, balanced flow of clear water back to the pool while allowing for more thorough backwashing.   Best of all, the full-flow technology reduces your energy costs because the filter operates for shorter periods.       Six-position valve puts you in control. The patented, multi-port control valve was designed with six pool filter positions. An easy-to-use lever-action handle lets you quickly dial any function. Long-lasting convenience. You can easily access the series pool filter with pump assembly for simple servicing via the unique folding ball joint in the laterals. A corrosion-proof housing protects the filter from severe weather for years to come.     Water filtration technical Characteristics   Model NO. Valve Size Flow Rate Sand  FSF 1.5"/ 50mm 4.36 - 15.6cbm/ h 20 - 145kg   Product Advantage The feature of a swimming pool sand filter and pump: 1) Unique and advanced design ensures fast draining and stabilizes water flow  2) The sand filter comes with a precise pressure gauge  3) Efficient multi-lateral underdrain assembly and self-cleaning laterals give totally balanced flow and backwashing  4) It is easy to install and to maintain  5) The outlet turbidity is less than 2FTU