I have a 3 ton Geo system I installed 2 years ago for a customer which has worked great until now, the lake loop piping is leaking and losing pressure. The leak must be very small since it takes 6 to 8 weeks to leak down from 45 psi. Have any of you guys used a sealant product in a leaking loop and if it worked can you provide the name and source of the sealant? I have asked my suppliers and no one offers such a product. My only other option would be to float the loop to check for leaks. Thanks for any help.