started w/green, killed algae. filter returned green to pool. bought new cartridges-still returned green. washed filter, pool store said bad move just keep circulating brushing etc wait for pressure build. pool turned cloudy white/gray. brushed, vacuumed no better. taylor fas-dpd kit results: fc 0.6, cc 0.8, ph 7.5, ta 80-90, ch 140, cy 48-52, old eyes not sure. superchlor w/liq chlor 3 gals. got to 11 ppm fc. let it dilute and retested. fc 0.8 cc 0.6 ph 7.6, ta 80, ch 140, cy 32 wife eyes, i still saw black dot. superchlor again w/6 gals got fc as high as 27 ppm. still had 1.0 cc. as fc dropped cc went to less than .5ppm, then to 0. fc at 20 ppm, cc at 0.clarity seemed a little better and slight increase in filter pressure. 3hrs. later fc at 13.5 ppm cc at 0. clarity slightly worse. i'm looking for a high bridge to jump off, been at this for a month--any ideas. p.s. 10 yr old pool under my care only, never had this happen before.