I'm resurecting the green, neglected pool at my new house. I have gotten the water cleaned up, all chemicals adjusted and just replaced the noisy leaking pump with a 1hp two speed Whisperflo.
The pressure at the sand filter was 19psi (with new pressure gauge) even after backwashing. The previous owners had the 1.5" backwash plumbed down to 3/4" that they could attach a hose to for water the lawn (I'm guessing).
I redid the inlet plumbing to the filter and the backwash plumbing, staying with all 1.5".
I backwashed the filter and only clean water came out. The pressure may have only dropped .5 psi.
Decided to pull the top cap and do the hose flush trick.
Instantly the water coming out was discustingly brown with lots of large particles flowing out. After 30 minutes of flushing and gently moving the hose to different spots the overflow water cleared up a little but still had LOTS of large paint chips/dead algae/hair/brush bristles/other random dirt-like stuff pouring out. I put the cap back on and purged the air out. Pressure was down to 16.
Should I continue flushing it or just wash the sand out and replace?
The filter is a Pentair Triton II but I'm not sure if it's a 50 or 60. All my measurements are just a little off from what they have posted.
50lbs bags of sand from the PS are about 10 bucks. It would be about 40-50 bucks for replacement sand... and the peace of mind that all is good and clean. I would also add some DE to help the filtering.