Cartridge Startup 1. Super-oxidize (shock) the pool. On the first day, super-oxidize the water with 1 lb. dry or 1 gallon liquid chlorine per 10,000 gallons of water to burn off contaminants and to activate the cartridge. 2. To activate the Nature² cartridge, you must either: Run the pump and filter system 24 hours a day for 4 days, or; Run the pump and filter system 6 hours a day for 14 days. 3. Maintain 1-2 parts per million residual chlorine level throughout the activation period. 4. Once the Cartridge Activation period is complete, let the chlorine residual drop to 0.4 - 0.6 ppm. Follow the maintenance recipe. Note: This procedure must be followed whenever installing a new cartridge. When Do I Replace The Cartridge? In snowbelt regions (3-6 month pool season), discard your used cartridge when you close your pool at the end of the season. Startup with a new cartridge when you open your pool in the spring. In sunbelt regions (7-12 month pool season), change the cartridge every 6 months whether or not you plan to use the pool for swimming. Low Chlorine Maintenance Recipe Ingredients: Nature² Purifier Chlorine granules, tablets or liquid pH and Total Alkalinity adjusting chemicals Total Hardness increaser, if needed Water Test Kit Cyanuric Acid After the 4 day or 14 day Cartridge Activation Period is completed, allow the chlorine level to drop to 0.4 - 0.6 ppm then: How Often: What to do: Every Day Run pump and filter system at least 6 hours daily. Once a Week Balance pH and Total Alkalinity. Twice a Week Check chlorine residual; add chlorine to maintain a 0.4 - 0.6 ppm residual. As Needed If the water starts to look hazy, super-oxidize (shock) using 1 lb. of chlorine granules or 1 lb. of non-chlorine oxidizer per 10,000 gallons of water. Add cyanuric acid to maintain 50 parts per million. Note: After heavy use or rainstorms, additional super-oxidation treatments are recommended.