Technically, you’re right. Problem is I have one that I cleaned with Oxyclean and 140° water and I’ve got several bulges on the sides. So, rather than continue to ‘bulge’ my Better Bottles, I’ve taken to reducing the temp of the water. If I can get a good clean with the tablets at a lower temp, that would work for me.
I ran the majority of my R&D testing on the Carboy Tablets at 115-120 degree water. They should work fine at that temperature. Lower than 100 is not highly recommended - the tablets will dissolve much slower at lower temperatures.
As for availability, the Keg & Carboy Tablets have been for sale through the BSG HandCraft catalog for about six weeks, since mid-December. If your LHBS does business with BSG, they should be easy to order in. If your shop doesn’t carry them, give them a reason to and ask for them! I’d be happy to talk to your shop and answer any questions, just let me know what I can do to help.
I found this listed in one of my beer catalogs at $9 a pound. Even if it is way better than the $1 a pound oxy cleaner I get at the DollarTree it’s a bit rich for my blood.