I am getting concerned that I have a liner leak. First, the weather here has been hot, dry and windy for the last month with cold fronts passing through bringing in dry air, which never happens in August. Through all of that my water loss has grown to about 1/2" a day. The heat has backed off a little in the last week, but I'm still at 1/2" a day.
I started the year around 1/8" to 3/16" loss daily and had about 1/4" to 5/16" loss last year at the worst, but it wasnt this hot for this long last year. The water temperature is around 90°F.
The liner is just over 1 year old and was installed by a local pool company. There are no plumbing or pump leaks. The pump and plumbing is all in one place and visible.
There is no visible dampness around pool. I do have a pool deck hiding ~1/4 of the pool perimeter.
There is not much splashout when people are in the pool.
I did a bucket test for the last two days and what I have found is that the pool looses about 1/4" overnight with the sun down while the bucket loses about 1/16". During the day with the sun up, the pool and bucket losses match at 1/4". Is there a good explanation why the pool could evaporate more than the bucket at night? More exposed surface area? I have the bucket filled to about 3" from the top of the bucket. The bucket has been sitting on the top pool step. The water level in the bucket is about 6" above the pool water level. The water in the bucket is a little warmer (5°F?) than the pool water.
At 3/16" "leaked" overnight, that should be 100 gallons lost. I should have visible evidence of that much water leaking, should I not? If not, I dont know how I will ever find the leak - if it is really leaking.
Here's the bucket on the steps: