A homemade, three-pitcher filter unit, one of the
simplest and most inexpensive ways treat drinking
water. The first pitcher contains coarse sand. The
second contains wood charcoal and fine sand, and
the third collects the filtered water.
Each kalshi has certain media and function:
Top kalshi - coarse sand.
Middle kalshi - 2 kg fine sand and 1 kg of
Bottom kalshi - collection container
A sari cloth is sometimes used as an
additional filter between the top 2 kalshi.