Rendezvous Protect Plus Qt.
This product should be added every time you refill your spa! This product helps against any metals, calcium, iron, copper that is in your water that could counteract the chemicals that you are adding. Normal dosage of this product is 1- 16oz container every time you refill your spa. Let the water circulate for 24 hours with just this product and the fresh water before adding any other chemicals. Some spas may require a higher dosage depending on the size as well as your water condition.