I have particles on the bottom of my pool that re-appear approx 1 hour after I vaccuum them out of the pool. They resemble sand in color, but they are not sand particles. They tend to disovle into the water if I brush them. They tend to form in lines along the seams on the slope from the shallow in to the deep end as well as ring the seams along the deep end. They are also form on the shallow end in sporatic circles or spots. I have tried algy busters but that does not solve the problem.
This is the first season on my new liner. I have a two yr old sand filter with new regular sand this season. I used the Zeobrite sand last season. I installed the AquaRite SWG this season and pool balance is basically good except that I can not get ride of this substance. I sweep the pool, backwash the filter, & the substance begins re-appearing in about an hr. Yesterday after I swept the pool, I turned the pump off to see if the material would re-appear. It did return but to a much smaller amount. I turned the pump on today and I got the normal amount of substance back within an hour. It's as if this material disolves when swept and settles back into the pool upon re-circulation. I have tried several times sweeping while backwashing to by-pass the filter, but the material returns.