I've been battling low chlorine levels and thought my salt cell wasn't working but my PoolPilot says it is. Started seeing green/black spots on vinyl liner so manually brushed, shocked with granules calcium hypo. and vacuumed pool. Water looks clear but after shocking I see clumps floating on surface of water. Went through this routine a couple of times. Pool store says I have mustard algae so treated with yellow out and 4 lbs shock as directed. I keep seeing more dead stuff at bottom of pool but a few green/black spots still persisting. Now pool store tested for phosphates and said reading is over 1000. They sold me Phosfree but the instructions they gave me didn't match the label. Before I do anything else I figured I should ask you guys. I think my alkalinity is low for one thing and am worried about stabilizer levels. Also from previous posts think my chlorine still need to go higher. I have 27000 gal salt water vinyl lined pool.
Ca hardness. 203