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Assuming there are no leaks in the Plumbing or structure of the pool and trough, there are several factors to consider.

If the vanishing edge pump runs daily for any period of time, then the effects of evaporation over the entire surface of the pool will be noticed in the water level in the trough. For example, if the pool is ten times wider than the trough, or has ten times the surface area, then a 0.2"/day water loss/day in the pool due to evaporation would result in a 2" drop in the water level in the trough. This doesn't include the normal water loss in the trough itself due to evaporation or the additional evaporation caused by having a thin sheet of water flowing down the face of the vanishing edge feature, or by water that splashes out of the trough due to wind or poor design.

If you're losing more than 4" per day in your vanishing edge trough, I would suspect a leak somewhere in the system. The leak could be in the pool plumbing or structure or in the vanishing edge trough structure or plumbing.

To see how much water you're losing in the trough, run the pump until the pool overflows into the trough, then turn off all the pumps and wait about 5 minutes for the water level to stabilize. Mark or measure the water level in the trough. Do the same thing 24 hours later - this way you're comparing apples to apples. Of course turn off any autofill devices during the test.

If you think you have a leak, call a pro like American Leak Detection to test your pool.

www.americanleakdetection.com

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Q: What is the evaporation rate of a pool with a vanishing edge?
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