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Do you know how many gallons of water are in your pool? Any discussion about chemical additions requires that you know the approximate gallons of water in your pool. Knowing the capacity of your pool (in terms of approximate gallons) is mandatory if chemical additions are to be made correctly. To assist in calculating the approximate gallons of water in your pool, here are pool industry-endorsed formulas based on the shape of your pool:

RECTANGLE OR ROMAN-END OR GRECIAN OR SQUARE: Length x Width x AVERAGE DEPTH x 7.5
ROUND: DIAMETER x Diameter x Diameter x 5.9
OVAL: Longest Length x Longest Width x Average Depth x 5.9
KIDNEY: Longest Length x Longest Width x Average Depth x 5.9
ANY L-SHAPE: Break the "L" into two separate rectangles (or squares). Then, use the formula for a rectangle (or square) for each section. Finally, add the two sections together. Length x Width x Average Depth x 7.5 + Length x Width x Average Depth x 7.5

FREE FORM OR IRREGULAR SHAPES: Consult with the pool professional that built your pool, as they may have the dig diagrams or spec sheets on file that list the total gallons. If they do not have the information on file or if they are out of business, call the local pool professional that you currently use; they will be able to offer a formula based on your specific free form or irregular shape pool and its specific dimensions (length, width, and depth) in order to help you calculate the total gallons of your pool.