Rubenjam

Thanks Waterbear your a legend, I will add a couple of photos to confirm your diagnoses.

Thanks Waterbear for you your interest. The link for the problem others have had was "Help Vaccuming Out Residule in Pool" with that spelling. Above ground vinyl pool 12000 litres. Using Chlorine Hy-Clor Liquid chlorine. City water. Free chlorine 2.48, Total chlorine 2.48, PH 7.6, Cyanuric acid 64, Total alkalinity 110, Total alkalinity Adjusted 89, Total Hardness 102, Magnesium hardness 0, Calcium hardness 102, Phosphates 0, Total copper 0.2, LSI-0.51.

All my chemicals are excellent, water is clear and sparkling. I used a water clarifier and since then I have a brown dusty residue on the bottom of the pool that vacuums up but returns with hours. If I leave the cartridge filter off it remain clear of the residue but once the filter starts the problem returns to the pool base. What could it be and what is the solution? I have noted on the site that other pool owners have the same problem without a fix.