Water loss that continues with the equipment off points to the pool structure, the suction side of the plumbing, or the fittings and penetrations: the skimmer throat, returns, light niche or main drain. This pattern rules out the pressure-side plumbing, which narrows the search considerably.
Watch where the level stops. If the pool drops and then holds at a certain height, the leak is at that height, such as the bottom of the skimmer opening, a return fitting or the top of the light niche. If the level keeps dropping without stopping, the main drain, the shell or a suction line is more likely.
Still not sure it’s a leak?
Describe what your pool is doing, and we will tell you what it may be and what a visit would involve. If the water level is dropping fast, call us right away.