I have a DE filter. Over all it seems to work great. However, my pool is in a fairly wooded area--I do have an automatic cover and I keep it covered at all times it is not in use. Occasionally, I get this very lightweight matter in the pool. It is about the size, weight, and density of oregano as a reference. When I vacuum it probably 80% of it winds back in the pool. Therefore, it can take several days to get rid of it, unless I give up and just vacuum to waste.

Should I be concerned that this is an indication of some type of filter malfuction, or does this seem normal? I have examined the element and there does not seem to be any tears or holes--and it was suitably covered with DE. This is just my second full year with the pool and the water is chemically great and is otherwise crystal clear.