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I agree with Dave that first step is to check if the water is safe to drink. If it is, it might well be easier to reassure people that the water is safe rather than find a technical solution to an aesthetic issue. If you do look at slow sand filtration further, you could make a small pilot unit in a large plastic barrel so see whether a) it works and b) equally importantly whether the users are willing and able to maintain the pilot unit before considering a full-scale filter. Maintenance is always the bigger problem, and slow sand filters need careful maintenance. Good luck