just about every day I have fine debris at the bottom of my pool. to me it appears to be a very fine sand and it is always found down stream of the outlet port of our pump ( I have an elbow that I can make it go different directions ).
our sand filter operates pretty much as I would expect from my reading. we start at 8psi and within a couple of weeks we get to 10-11 psi and then backwash it.
we have large trees all around us and gain leaves / acorns all the time. we are pretty dilligent about cleaning the bottom almost daily and it wouldn't be very fun to swim without this work because of all of this litter in the pool.
even when we haven't had leaves / acorns fall in the pool that fine debris is on the bottom.
this is our first season of pool ownership and I don't really know what to expect. is this an indication of a poorly functioning sand filter?