The pool sand filter is mainly made of advanced glass fiber and polyester, so as to ensure that the Perry filter has a firm structure, is not easy to wear and is durable. The six-position valve of the filter can be used for six different procedures, and it is easy to operate. It can be used with a variety of filter materials, such as filter sand, activated carbon and resin. Especially suitable for water purification, sewage treatment, swimming pools, fish ponds, massage pools, etc.