Been trying the DE trick in the sand filter on and off so far this season and i can affirm that its making my water cloudy. anybody else see this happen? My filter is a older one, maybe the trick only works with newer ones. Theres nothing wrong with the filter, I just wanted to see if what everyone is saying was true so back in May I tried the trick. Water was cloudy back then(due to an algae prob and levels being off) before I did it, so I couldn't be sure if the DE was further contributing or not. So after getting all the levels straight (alk was high, had to drain to lower cya) and algae gone, I no longer needed to use the DE since my water was crystal clear. This week, I noticed a problem with some fine particles in the water. You could only see them while underwater with goggles on. Looks to be very tiny pieces of leaves or something. We do have a neighbors tree that overhangs the pool and loses its leaves, because I think its dying from a disease or something. Thats whole other story. Anyways, I tried the DE trick again, and woke up Thursday to cloudy water. My levels are fine. FC has never changed, I keep it 5ppm, because my cya is 60. CC is 0. Use the BBB method as well, not since May have I used pucks or powder, just bleach. PH is 7.2, Alk at 110. Don't know the hardness, because 1, the HTH test kit that I use doesn't turn red when adding the indicator, rendering me an inaccurate test, 2, I have a vinyl liner, so it shouldn't matter, and 3, I have no signs of high CAL such as crystal buildup or anything. So like I said, I've eliminated all other causes of the cloudiness, except the DE. And since that the only thing that has changed this week, it can be the ony possible cause. Anyone else see this happen?