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PWC's, PWC's, PWC's ... Did you boil it first? If not you can remove it ... If possible ... and boil it. That'll help release a bunch of tannins ... Though I'll
Warn you ... You'd be in for a couple of hours of boiling. Mopani is notorious
For being chuck full of tannins.. even after much boiling.
Adding carbon to your filter will help remove tannins.
Also, if you have a canister filter Purgen removes tannins out of the water like nobody's business. It will also last months (usually) to keep tannins down if they still persist even after boiling. Carbon works but is exhausted much faster and needs replacing.