Changes

Slow sand filter

1 byte added, 03:17, 31 July 2012

→‎Cost

|m3Cost= € 0,68

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These costs assume the lifetime is 15 years with daily production of 2.750 litres; O&M and salary included; salary is based on 1 working day of operator, assuming an average gross annual income of € 500 in developing countries.

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