i have decided to replace all 9 of my jets with waterway adjustable jets. i am also replacing everything else(main drain, plumbing, spa pack,motor, and heater). i also went and ripped up all the insulation off the shell, which was a good thing i did, cause i had a lot of mold and mildew under the insulation, which to me indicate either a leak or heavy considation(sp?). while i am waiting on my jets to arrive, i am trying to figure out a way to replace the insulation. any ideas on what kind i can use to help it stay warmer better?