Our old built-in pool ( gunite, made in 1960 ) has a nice leak - it drops about 4 inches/day. The water level drops to about the level of the light and then slows down and seems to stop - I've plugged up the skimmer , side outlet and drain and return lines (
and it still leaks ) and so of course it's probably leaking out of the light.
Pool is empty and I took the light off (see photo). One thing I noticed is that in the back of the niche wear where the pool light wire goes thru - well the wire goes thru that hole loosely. Shouldn't there be a seal ( or something ) where the wire goes through the back of the niche?