Hello. My Caldera hot tub is just over a year old and has developed two small blisters on the interior shell surface. It was installed correctly and the water chemistry has been maintained with Caldera's chemicals. I've looked online and found where someone said it's a company defect where the acrylic is delaminating and that you could use a hair dryer on the high setting until the blister becomes pliable and then pin prick it and use hand pressure to release the air behind it. Has anyone else had this problem? If I just leave it alone will it get worse -- crack -- develope a leak? Thanks in advance for any help and/or advice you can give me.