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I think some may be missing the fact that this "walstad" tank has no filter, you are relying on heavily planted and time to keep the toxins at bay. In this case, your option is water changes, carbon or purigen are not an option as they are used with a normal filter. I have a 1 gallon walstad bowl with miracle grow organic and a sizeable chunk of DW. My tannins still come back after 3 months, but I am doing a PWC once a week or so, I sometimes do two in a row to drop the tannins further... without soaking the materials first or boiling them (which takes away some of the nutrients) its something that will be there for a while, but the regular water changes are our friends,
 
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