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Need advise if its safe: Have had pool open 3 weeks have been able to keep water clear only with Aqua chem plus chlorine tabs and a bag of 1 lb shock same brand every other day. Water tested :Alk 80,ph 6.4,free clo -0-,hrd 50,cya 0. Pool details:Rectangle 16x36, 3ft to 10 ft. aprox 30,000...