I don't have the slightest idea of the size of the pump, the filter is sand and has a vinyl liner. We've put 75 lbs of chlorine concentrate (55 pct available chlorine according to the bin), plus about 15 lbs of "shock n swim" - which shows 45 pct available chlorine. Two full bottles of "AlgaeClear 60" (poly ethylene). A half bottle of ph Up (2.5 lbs) has been sprinkled in there to keep the ph level according to the test strip. No alkalinity plus or minus thus far. Our normal method of chlorination (once the pool gets running) is chlorine tablets.
Our test results today were FCI - 0, TCI - .97, PH - 6.3, TA - 49, CYA - OR. Three days prior all are numbers were "perfect" except the chlorine was still 0. After adding about 15 lbs of chlorine yesterday, it finally registered a nice purple color on the test strips but today it registers none.
I couldn't tell you what the stabilizer level was when we closed it up, just that there was some added when it was closed. The easiest solution would be to drain the pool every year and just start out fresh, but the pool guy claims the sides will collapse.