Ordered Puregen off Amazon tonight. It got rave reviews for tannin removal. Will see how that goes. Am leaving out the mopani. Done with it. It smelled like a bog when it was in the tank (only thing that did) and it had white resins leaking and cloudy billowy stuff that was still growing after 3 weeks and I was told it would only last one or so...This and the mildew I could not stop from growing on the portion out of the water is probably why it stunk so bad when it was boiled. I was told by a Manzanita seller their tannin release is much lower...Thinking about it.