Features Instantly lowers pH in spa and hot tub water Prevents scale buildup in spa Benefits Helps protect equipment from damage caused by scale Provides comfort to users Easy to use application Applications Broadcast over entire spa water surface with pump running If pH is between 7.7-8.0, add 1/4 ounce (2 tsp) for every 500 gallons of water If pH is above 8.0 then add 1/2 ounce (4 tsp) for every 500 gallons of water Retest pH after 30 minutes, reapply if needed