Response to Phosfree raises the filter pressure because it puts a coating on the filter media (sand, d.e., or cartridge) so it is able to catch the phosphates. After an 8-10 psi increase in the filter pressure, the filter should be cleaned or backwashed.

An image is worth 1,000 words! Add an image or two to your question to help ensure it is answered accurately.



Yes, please email me exclusive discounts, swimming pool tips and helpful how to guides. This comment may be posted on a public site. Do not include: HTML, references to other retailers, pricing, personal information, or any profane, inflammatory language.