Drained pool due to algae bloom, Shocked pool and purchased new TF-100 test kit. Added 1 gallon chlorine and it does not register as pool having any chlorine, added another 1/2 gallon chlorine next day, still showing no chlorine in pool? I am surprised. Do I need to keep adding chlorine until it show on test kit or do I need to add conditioner so chlorine will register on test?