Mariza,
At 500 sq ft that works out to about 300 gallons per inch. Need to know what kind of a pool. Liner or what and I asume it's an in-ground? Let us know. There are a bunch of things to do to eliminate common leak points. Start by getting a better idea of the leak rate over time. It helps to measure water depth accurately every so often so you can determine if the leak rate changes with depth. That may point to a suspect area like the skimmer or returns or something else. You can make an accurate measurement with a ruler referencing to some known point like a specific spot on a step, skimmer plate or even the bottom at the same point. For example if you find one day you lost 300 gallons and 2 days later that decreased to 100 gallons, the water surface level is close to the leak. If no change then the leak is deeper. We'll get more detailed as we go on.
Al
BYW: I did a lot of experimenting a few years ago finding my leak which turned out to be at the deep end. About 50 gal per hour. Also developed a neat way to lay a good deep end patch. Vinyl lined IG pool.
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