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Formula For Average Gallons In Rectangle, Square Or Freeform Pools:
Length x Width x Average Depth x 7.5 = Total gallons Formula For Average Gallons In Circular Pools:
Diameter x Diameter x Average Depth x 5.9 = Total gallons Formula For Average Gallons In Oval Pools:
Length x Width x Average Depth x 5.9 = Total gallons Formula For Average Depth Of Pools With Slopes:
Shallow End Depth + Deep End Depth Divided by 2 = Average Depth
Since 1 cubic foot is equivalent to 7.48051948052 gallons, you could attempt to do the math & make allowances for overflow & for a distance-to-the-top measure of what could be about half a foot. Otherwise, there are charts that help with understanding this. http://www.swimtownpools.com/how-many-gallons-does-my-pool-hold-s/1317.htm
To calculate how much water in a swimming pool, in 'US Feet':
Length x Width = Surface Feet
Surface Feet x Average Depth = Cubic Feet
Cubic Feet x 7.5 = Total Gallons
not possible to calculate with the information provided. here is a basic formula to get you close.
length x width x average depth x height in feet x 7.5 gallons / cubic ft
You don't say how deep it is. Since you say 18 foot pool, I presume it is round. AT 2 foot depth = 3817; 3 foot depth = 5726 gallons; 4 foot depth 7634; 5 foot depth is 9543. Your salt bag should tell you how much to put in referencing the gallons.
The volume of a 24x4 pool is 1809.6 cubic feet [Volume=pi x radius squared x height, or V=3.14159 x(12x12)x4], and the 18 foot pool is 1017.9 cubic feet [V=3.14159 x (9x9)x4]. When you multiply the number of cubic feet by the conversion factor of 7.48 gallons per cubic foot, you come out with 13,536 gallons versus 7614 gallons. Since the volume is nearly double, I don't think the other filter will cut it for very long. Is the top that is cracked in the valve body or the top part of the tank? It might be cheaper and easier to just replace the defective part in the long run than to use an undersized filter that will die prematurely.
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