American Leak Detection came out to determine if there was a leak in my pool or my spa. They did their test and couldn't find any leak, though they believed the skimmer in my spa could be leaking water. They recommended that I replace the skimmer. So, a gentlemen came out and installed a skimmer and a float valve as well. Within a week later, my spa overflowed over night. I called my regular pool service people, who removed the float valve and told me that American Leak Detection should have known better.
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