I don't know if this will help, but I have used this in the past for other leaks around the house with success. It's an epoxy putty and it says it is great for fuel tanks (so it should resist pool chemicals), and that it is "Drinking Water Safe" (so know worries about it being toxic after it cures). It claims it can be used even under water (though I have never tried that). Good luck and I hope this can help you!
Here is a link to it at Home Depot (where I got mine) ...
JB WaterWeld