LOW-COST WATER FILTRATION SYSTEM
2021-2-17u2002·u2002For enclosed filters, it should be first washed thoroughly to lose most material under 1 mm. Fishing Harbour near Semarang - 60/40. The -1 mm fraction is a mixture of sand, mostly quartz but with mica flakes, and numerous shell fragments. The +1 mm fraction is mostly shell fragments, with some mica, pieces of coral and granite pebbles.
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