This is the reply that I received from the manufacturer of tannin for aluminum boilers TGWT.
So your reply was spot on Brett.
Thanks for your interest in TGWT. Unfortunately, we are only working in the industrial arena. We do not have household size container. If you just purchased your coffee machine, we can give you the best trick, also applied on the industrial side. You have to get rid of hardness (calcium and magnesium) in the water you are going to poor in your coffee machine. If you get rid of hardness, you will avoid most of the scale. The small amount that will occur will be easily taken out with your citric acid. You can buy small cartridge that you put under your sink that will do the job. If you want to go a little further, you have to keep your pH between 7.0 to 8.0. Do not go over 8.0. By doing that, you should be able to keep it clean.
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