Just keep your pool skimmer cleaned out at all times less you cover it during winter and fall.... check it frequently,, especially if its swimming season.... I kept the polaris in the pool most times and ran it every day.... atmospheric fallout is a nuisance too... use the skimmer net on the aluminum pole and scoop us all that surface mess often..it settles to the bottom and adds to the sedimentation...... bees and wasps love swimming pools.
Always check for this first, but Tell the family don't suck in some pool water in their mouths and play like a water fountain.... you're going to find a rat or mouse snake or frog in the skimmer soon enough if you haven't already... that'll turn em green in the face...