Hi Josh, I changed my kontiki kiln the way you did and tested the char on filtering red raspberry juice as an experiment to my daughter's class. I did not yet measure the temp during gasification but it glowed red and was very hot run. We built the filter in a plastic coca cola buttle, filled with only the crushed char. The juice after filtration became totally transparent and clear water. Another advantage is the option to drink this water and test if sweet taste is left. I can sent you few pictures if you like. Thanks!

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