The usual rule is that you backwash a sand filter whenever the pressure rises 8-10 psi over clean filter pressure. (Hi, Jan, and welcome you also to the Pool Forum!)
Re: Trying bleach and borax for the first time
The usual rule is that you backwash a sand filter whenever the pressure rises 8-10 psi over clean filter pressure. (Hi, Jan, and welcome you also to the Pool Forum!)
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