Hello, My pool construction was completed Sept 2020. I have a fiberglass 19k gallon pool with a Pentair system including 3 hp VSP pump and cartridge filter. I use TFP and pool math and have all chemicals in or close to range. Water in daytime is absolutely clear. Yet when the pool lights come on there is particles floating everywhere. I replaced filter 3 weeks ago with a brand new after the old was overused to clean out the construction mess. I read on TFP not to aid unnecessary chemicals to clarify so asking for help.