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Water testing and correcting potential problems can't be accurately done if you don't know how much water your pool holds. Plus, you can end up spending a lot more in chemical treatments in the long run. Here's a simple method for measuring the number of gallons in your pool.
First of all, you need to determine your average depth. The simplest method is to tie a string that's been marked off in feet to a weighted object and measure the deep end, then the shallow end. Add these two numbers together and divide by two to get your average depth. Use your average depth number in the following calculations to determine your pool's capacity. | 
