Hi, I'm new to an HOA board and our pool guy is charging over $2000/month for a relatively small pool. He claims that the insects and leaves cause the DE filters to be clogged, requiring them to be flushed weekly. Plus, he charges for coming over 5x/week to skim the water and vacuum/clean, etc. Is there such a thing as a prefilter that can trap the insects, etc. to reduce the clogging? It seems like everything I've read indicate that the DE filters should only need to be flushed a few times a year. Any tips, suggestions are appreciated. Thanks!