I have and 18' above ground pool with a hayard 18"sand filter 1/ 1/2 HP pump and automatic clorinator. System works fine except I continue to have very fine dust that accumulates when the filter runs .
I have tried back washing several times, and run the pool for several days with a slime bag in place. The dust is so fine that if I get into the pool with out the filter running and just push it around with my foot it disapearrs and will not come back until I run the filter. I tried running the filter for a couple of days with a slime bag on the out let, and the pool stayed clear all during that time no dust on the bottom. I then back washed the filter rinsed the lines and ran the filter through the slime bag for several hours. As soon as the filter ran again in the morning with the eye ball in place the dust was back. It almost seems more like a chemicial reatction of some sort.
The pool will stand clear after I stir the dust up for 12 hours some time and nothing percipitates out. Start the filter and it is back. I was sure it was just to fine for the sand filter, that is why I installed the slime bag. I tried adding sme DE type filter material to the sand filter, no effect. Again the filter ran for several days with the slime bag installed and no dust, as soon as I removed it and ran the filter the dust was back, need help.