Help I am just starting getting my pool ready Took the leaf cover off and vaccumed but of course I had a green swamp. So this am I shocked my pool with 3 128 oz 10% liquid chlorine- Kemtech brand. Prior to adding my TC was 0; Ph 6.8; TA 60; hardness 150. did not check my CYA. 3 1/2 hours later I went out- the green was lighter checked the TC and it was 1.5. I again added 3 bottles of liquid chlorine. Went back out 3 hrs later and the pool is brown. The good news is the tc- was 10.5. Early this weekend my husband used some Ascorbic acid to remove stain in pool- which it did. Stain now back. What have I done? I have a 15000 gallon fiberglas pool with a sand filter.