After using the metal out to rid my pool of the red water how do I keep it from turning red again shocking it always turns it discolored again… help


Any time you add fresh water add a small amount of metal remover to prevent the red coloration and staining. If it continues to react, there may be more metals present and you would need to further reduce it or you may have a filtration problem that is preventing proper metal filtration (this is needed to properly remove the metals).