Check the listing for details. Pristine Blue 64 oz - 2 Pack. Condition: New. Listed at 129.00 USD. Pristine Blue is the cornerstone for the Pristine Blue system. Pristine Blue is used to control algae and bacteria that causes odor problems in pools and spas. Pristine Blue only needs to be added once every 2 weeks. Pristine Blue is very gentle on your skin and eyes. Pristine Blue will not bleach vinyl liners and you can swim immediately after application. This product is environmentally friendly and EPA registered as an algicide/bactericide. You wont believe how easy Pristine Blue is to use. First Time Using Pristine BlueDosage For Spas and Hot Tubs:Use 1 milliliter of Pristine Blue per 100 gallons of water Run filter for 1 hour.Dosage For Pools:Use 2 fluid ounces of Pristine Blue per 1,000 gallons of water (20 fluid ounces per 10,000 gallons)Every 2 Week Maintenance (14 Days):Use the Pristine Blue Mini Test Kit to measure the copper level in your water. The copper level has slowly decreased since the last time you added the Pristine Blue. You need to get the Pristine Blue (copper) level of your water back to 0.9 ppm. Do NOT exceed 1.0 ppm metallic copper. Use the dosage calculator to determine the amount of Pristine Blue to add.IMPORTANT:DO NOT poor into the skimmerDO NOT add Pristine Blue for 2 WeeksDO NOT store Pristine Blue at temperatures below 32 degrees F