When we opened the pool this year, we had a lot of algae. SLAMed it, then had a bunch of dead algae at the bottom. When I'd vacuum it up, you'd see a cloud coming out of the returns. Figured something was broken inside my sand filter, so I had the service tech come out. He took everything apart, said there were no problems, and put it back together. I've been out of town since then, and my husband had a hard time getting the water clear. I'm home now and working on it. Got the chemicals in line (ph was way off), but it's still not clear this morning so I threw some DE into the skimmer basket and got HUGE plumes from the returns. Something is wrong, right?? Because the pool tech who was out here told me dead algae is too small to be caught by the sand filter and I needed to vacuum to waste. But I'm now wondering if he was full of boloney and I paid him for nothing when there really was a problem. Add to that, I wasn't comfortable taking the filter apart myself, which is why I called a tech to begin with. Was that a mistake?