>>330740That's only going to viably filter out large physical and some chemical contaminants. I wouldn't trust it to remove pathogens.
While the idea IS based on actual water cleaning technology, it's based on biofilms on the sand and rocks that take a while to develop, and you should still test the results before trusting them.
If you just want to clean water a bit before boiling it, this is fine, but boiling, or using a chemical sterilizer, is far superior.
>>330828This inna-shit has to stop. It sounds really stupid.
>>330787Jesus. This gave me flashbacks of earlier when I was working in my garden and I managed to stab myself under my fingernail with bamboo.
>>331592This is a more accurate depiction.
>>331603Look up sand filters with regards to water purification. It used to be more common, but it was used on a massive scale to provide clean water to people. It has to do with the sand growing this film of bacteria that act as a biological filter.
>>331615You should consider not trusting your sense of smell.
