From what I understand, If your sand filter is working properly, it should not be putting any sand in the pool. Even one small break or crack in a lateral could be the culprit. When replacing the laterals it is very important to replace the sand very carefully when first filling so that it does not put pressure down on the laterals. I had this experience myself when I replaced mine. Maybe you cracked one of the new laterals?


or maybe the sand is coming from somewhere else? Like a kids sand box?

Hal