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the way i rinse it is just by filling up a bucket of tap water and sway it a little. repeat a couple of times and run it through the tap water for couple of sec to make sure the water comes out clear. and don't squeeze it.
i dont think tapwater is that poisoning. Its good enough for the humans... im sure its good enough to rinse the carbon. you just don't want to run too much water ( any water ) through it.