I have recently completed a SLAM and added DE to my sand filter to catch the finer particles still in the pool, to get that crystal clear water.
I followed the instructions from this site to add enough DE to raise the pressure by 1 psi. I saw the pressure rise even more over the next 30 minutes once it started catching the finer particles. But then something strange happened - the pressure over the next several hours reduced to its base pressure. What's more - I saw what looked like a fine white cloudiness coming out of the jets. The combination of these two events leads me to believe that my sand filter didn't "catch" the DE, and allowed it to pass back through to my pool.
Does this mean my filter needs another deep clean? I cleaned it for 4 hours about a month ago.
I followed the instructions from this site to add enough DE to raise the pressure by 1 psi. I saw the pressure rise even more over the next 30 minutes once it started catching the finer particles. But then something strange happened - the pressure over the next several hours reduced to its base pressure. What's more - I saw what looked like a fine white cloudiness coming out of the jets. The combination of these two events leads me to believe that my sand filter didn't "catch" the DE, and allowed it to pass back through to my pool.
Does this mean my filter needs another deep clean? I cleaned it for 4 hours about a month ago.