A little over a month into our second season with an intex sand filter. It's never been open since new. My wife backwashed it yesterday in to the dog's little pool, why I don't know and don't really care to know but there was a bunch of sand there. Just a regular ~10" high plastic kiddie pool with 40-50% coverage of its bottom with sand.
I'm going to disconnect it and open it up today to see if it still has a good amount of sand, it seems like it needs backwashing a lot more frequently than what I remember. Anything wrong I should look for? or do these just do that/normal?