Hello, I have shocked our pool per your direction for three weeks. Finally passed to of the three overnight fc/ cc tests. Fc lose .5 & cc .5 TC is at 19. However water is still brownish with viability approx. 2.5-3 ft. PH was lil high prior to shock treatment, so straining on liner, skimmer & returns. I figure time to suspend iron with 3 qts Jacks Magic? When is it best to add product? Does the bottle give instructions on how/ where to add it? Thank you so much for your help, neve knew anything about a pool & tons of reading here almost have pool ready for the 4th!!