I am super frustrated.. I use Baquacil because my son cannot swim in chlorine. We have a 27' hard side pool with a Hayward DE filter. The 1st month was great .. super clear clean water. Then I had to add water, just under 500 gal from a friends well. I took a water sample to the pool store (ppl who installed my pool) because I thought after adding water I should have it checked. She made me feel stupid, saying "what do u just like us or something, you're here alot". I explained that I am simply following the schedule they gave me and that I was a few days early this time because I added water. She then tells me she needs a sample directly from the well but in a belittling manner. She did check my sample anyway and said all my levels were spot on. Then it rained for a few days and now my water is cloudy and I found backswimmer bugs in it (7 so far). I called the pool store to find out what to do and they told me they have in 40 years never heard of such bugs but would have someone call me back. No one has called me back. I feel really stupid now. So I decided to start researching what to do. I scrubbed the walls,floor and ladder then vacuumed. I back washed then cleaned the inside of the filter (see nasty pics) then I added a full dose of sanitizer, oxidizer, and algaecide and let my filter fun continuously for 24 hrs. Tested my levels and they are spot on but water is still cloudy and I found one more backswimmer. I am at a loss now ...and no one will swim because of the bugs and cloudy water... I'm beyond frustrated!!! HELP!!!