. . . membership updated.

Best Guess chart => http://pool9.net/cl-cya
Kit info => http://pool9.net/testkits


Volume calcs: 27 round w/ 48" walls => 42" water depth

13.5 x 13.5 x 3.14 (pi) x 3.5 ft x 7.46 gal/cft = 14,950 gallons.