It is very good invention but if we see in past , specially in rural area the waste of animal is considered the strong fertilizer. This Sol-Char Toilet is good intiviative to process the human waste in fertilizer that could be useful in growing the corps in cheap way.
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Yeah I know that animals waste are rich in Nitrogen, Potassium and Phosphorous but in urban areas people have limited lands to grow crops and there is not farming too much. In such case your poop comes as aid😀