This Natural Chemistry spa clear is a chitosan-based clarifier made from recycled crab shells. The highly concentrated natural formula quickly clears cloudy water. It is easily applied and impossible to overdose. Can use in dosage as 1-ounce per 200 gallons for standard rate and 2-ounce per 100 gallons for cloudy water rate. Apply clear at recommended dosage rate per gallons of pool water across pool water surface- concentrating on deep water areas. Using flip squirt cap, apply clear directly to surface until you reach suggested amount of ounces per gallons of water in your spa. Run filter system continually for at least six hours after application. Compatible with all sanitizers and spa surfaces. Non-toxic and will not harm the environment. Includes 12 spa clear container per pack. Comes in 16-ounce container. This product ships in approximately 1 days