Check the listing for details. Earth Science Pristine Check (64oz). Condition: New. Listed at 76.99 USD. Earth Science Pristine Check 64oz Pristine Check is the first step and preps the water for the Pristine Blue line of chemicals. Pristine Check remove excess calcium from the water and deposits it into your filter allowing you to wash it away. Product Dosage For Pools: 2 oz per 1,000 gallons of water. For Spas: 10 milliliters per 100 gallons of water. Directions For Spas and Hot Tubs: Apply at a rate of 10 milliliters per 100 gallons of water. For Pools: Apply at a rate of 2 ounces per 1,000 gallons of water. In pools wait one day after applying Pristine Check before adding Pristine Blue. It is essential to backwash or clean the filter after the use of Pristine Check. Returns are not accepted on opened or used products and are subject to a 10% restocking fee An RMA/RGA is required to return any item Buyer pays all return shipping If you have any questions, please contact Clearview Fireplace and Patio We would be happy to help