Okay I'm on my 3rd day now of the pool being at shock level and the color is still the same shade of green. I'm getting worried that I'm going to have to drain my pool. I have been brushing it often and constantly checking the FC level and keeping it above 15 but no results. Someone told me once that I need to kill the phosphates also. Do I need to do that and keep shocking it or do I just need to be more patient. I thought the color would have lightened by now. Please help.
FC - 20
pH - 7.8 (was 7.4 before I started shocking)
TA - 120
CH - 220
CYA - 30-50