Pool Light Niche Repair

Every leak hunter has met this pool: the plumbing passes its pressure tests, the shell shows nothing, and the water keeps disappearing anyway. More often than anyone expects, the answer is hiding behind the light.

The light niche is the wet housing set into the pool wall that holds the light fixture, and it’s connected to a conduit that runs back to the junction box on the deck. That conduit is the part almost everyone overlooks. When the seal at the niche fails, pool water enters the conduit and travels along it like water through a straw, exiting somewhere it was never supposed to be. The water loss looks like a mystery precisely because the exit is nowhere near the entrance.

Why it fools so many people

The niche passes every casual inspection. The light works fine, because the fixture is sealed and built to live underwater. There’s no visible crack, because the failure point sits behind the fixture where nobody looks. And the loss rate doesn’t change with the pump schedule the way plumbing leaks do, so the usual diagnostic logic comes up empty. That combination is how niche leaks earn homeowners a string of repairs that never move the water level: the money goes where the tests pointed, and the tests never pointed behind the light.

The fix for all that confusion is embarrassingly direct: dye at the niche with the water dead still. If the penetrations are pulling water, the dye shows it in seconds, and the mystery is over.

Sealing it, with the pool full

Confirmed leaks get the conduit connection and niche penetrations sealed with the pool full, then a second dye test verifies the loss has actually stopped rather than assuming it. When the niche body itself has failed, you get repair and replacement options priced side by side so the decision is yours, made with real numbers.