Filter puts sand in pool on pump start

Jcflood

New member
Jul 4, 2017
3
Detroit/MI
Pool Size
7600
Surface
Vinyl
Chlorine
Liquid Chlorine
I have been battling this all summer now. Last year I changed out the sand in my filter and everything was fine. This year when I opened the pool I was getting sand in it. I initially thought a lateral was broken.

However, I noticed if I let the filter run 24x7 no sand. If I kept it off no sand. I really started to pay attention. When the filter first turns on I get a cloud of sand out of the return then it stops blowing sand.

How do I go about finding the problem and fixing it? Could it still be a lateral? I was not able to find anything in the search
 
It is not completely unusual for a LITTLE sand to get into the pool. To me a "little" would be perhaps a half teaspoon

Have you tried the "rinse" position as you start up.......then go to "filter:?........maybe about a minute but no more than two?
 
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