Thanks for the responses. Please hang in here with me as I'm not able to go online every day. I'm working on getting the figures requested. The pool volume is 175,268 gal. It is a flat outdoor pool with no water features. There are 4 pumps running 4 sand filters. I expect they run 24/7 once started but will doublecheck that. With a low budget this summer, we expect to open it only for 6-7 weeks. Usage will be weekends only for Kid's Camp, Mission Work Camp, VBS, etc. I wouldn't expect the total # of people in the pool at one time to exceed 100 but will get other opinions about that and let you know if different. Temp is at the mercy of the weather but I'll ask whether anyone knows last year's high temp. Thanks---Hal