How much of a 3 in chlorine tablet do i put in 700 gallon pool?

This depends on the amount of chlorine the pool uses and this depends on how much use it gets the weather the amount of dust and debris falling into it etc. the only way to know is to test the water for free chlorine or have it tested by your pool shop. Test kits are also available at the pool shop and many department stores. A: After a few weeks of testing your pool you will become familiar with what it takes to adequately control the chlor. content in the pool. Each and every pool is different. It could take endless amounts of chlor. if you do not have any conditioner in the water. Haven't calculated the amount you list into gallons but would think one to 2 gal at a time at least once per week. TEST THE WATER EACH TIME.