I remember your design. As sand can contain crystals, mica and charcoal, it can clean stuff for sure. I would say it depends of the sand you use. It's still good if you start with non polluted water. But you live next to one of the highest mercury pollution on earth...So i would not drink it without further filtering... But it's me...lol
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we had our water tested.. it had no mercury.. that was in Kodai that has a very different source.. our source is from elsewhere.. quite local