My steel pressure tank has once again rusted and leaked. I live in Alaska and have a drain-back system (with a hole in my well pipe and a snifter valve downstream) so that water always drains from the line between the house and well and does not freeze. Hence I cannot use a bladder or diaphragm tank (as I understand it). Is there any disadvantage to going with a fiberglass tank instead of steel? I am considering a Flex-Lite FLS 40D (https://flexconind.com/wp-content/uploads/2021/09/FLS-Dual-Port-Spec-Sheet-LR.pdf). The obvious advantage is no rust, and less sweating would also be nice. Also, it's getting harder to find traditional tanks without bladder/diaphragm to replace every 10 years. But would it significantly outlive the 10 years I'm getting from a steel tank? I do let my house go cold and freeze hard during the Alaska winter - would that be detrimental to the tank (I would of course drain it). As a side question, is there any way I could actually use a bladder tank with a drain-back hole and snifter valve?