The Pool Math” Workbook, published by the National Swimming Pool Foundation® is designed for operators, service technicians, health officials, retail technicians and renovators. The book helps users calculate pool surface area, water volume, chemical dosage amounts, saturation index, filter surface area, flow rate, filter flow rate capacity, turnover rate, heater sizing, spa water draining frequency, make-up water amount, maximum user load and total dynamic head.www.nspf.commedia@nspf.org