Hope some one can help we have 24 ft above ground we have a DE filter system problem I'm having is there is some white stuff floating around on bottom I clarified I shocked it has been weeks my chlorine level is high I just got some clarifier I went to 2 diffrent pool places and showed picture one told me dead Alge other told me calcium residue anyone have ideas how to solve or what it is we got our pool put in last year so we are new to this