3-Kolshi Description

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Source: MIT

Description
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 wood charcoal
  • Bottom kalshi - collection container
A sari cloth is sometimes used as an additional filter between the top 2 kalshi.

Development
Indigenous Appropriate Technology

Benefits & Drawbacks

Benefits
  • Simple
  • Excellent microbial removal
  • Can be constructed of local materials
  • Income generation
Drawbacks
  • Fragile
  • Low flow (1-2 litres / hr.)
  • Irregular flow rate, requires frequent cleaning
  • Availability of cast iron chips

Costs

  • Capital Costs: $5.00 US
  • Operating & Maintenance: N/A