For increasing pH levels in pools Ships in 2 Lbs.plastic container with safety capRecommended UseCheck pH levels weekly using a reliable spa test kitIf the pH level is less than 7.2 adjust the pH to 7.2-7.6 using pH Plus1/3 cup of pH Plus will raise the pH level of 1000 gallons of water approximately 0.1 pH unitsPool should be running with water being agitated when adding pH Plus to pool