First post here and it's a doozy! We are newish pool owners. This is only our second full season with the pool. It's a San Juan Fiberglass pool. It's 15'11" x 39'7", 14,400 gallons. One skimmer, two main drains, two returns, two LED lights on opposite ends of the pool.
Now the problem...after some very heavy rain this winter we pulled back the corner of the cover to drop in our water pump to drain out some water. Imagine our surprise when we didn't see any water to pump out! We pulled the cover back further and found that the water level was almost flush with our second step. Which would be about 12 inches below the top of the pool. We did the bucket test and found out we are losing about 5-6 inches a week. The water level was below the skimmer and the returns but we were reluctant to let it drop below the lights since that would be pretty low.
We've had two leak detection companies come out and everything has checked out. The lines were all pressure tested and passed and there were no cracks in the shell. My suspicion has always been one of the lights however they were dye tested and didn't pull in any of the dye.
I am at a loss. It's incredibly frustrating, we are adding water every day which is messing up our chemistry of course. Is there something I'm missing? Is it possible that even though the lights didn't pull any of the dye that they could still be the culprit?
Thanks and pardon any ignorance in this post. Like I said, we are still learning all of the ins and outs of pool ownership and honestly aren't impressed so far!