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My favourite feature of centralised chlorination is that you can easily, quickly & cheaply check if your water is "safe" at any point in your network. If you still have a chlorine residual at the point of use, the chance is very high that your water isn't seriously biologically contaminated.

I'd like to think that with a well at the top of a hill, if you can adequately protect the source, you may not need coagulation & filtration. Check the turbidity, if it is consistently below 1NTU and you don't have any chemical contaminants, then you should be OK with just 20 minutes of chlorine contact time (ideally a contact tank) before use. You could be OK as high as 5NTU, I'd recommend getting a professional involved either way.

If you are supplying a reasonable size of village, I would imagine that central chlorination would be the best value solution.

My favourite feature of centralised chlorination is that you can easily, quickly & cheaply check if your water is "safe" at any point in your network. If you still have a chlorine residual at the point of use, the chance is very high that your water isn't seriously biologically contaminated.

I'd like to think that with a well at the top of a hill, if you can adequately protect the source, you may not need coagulation & filtration. Check the turbidity, turbidity*, if it is consistently below 1NTU and you don't have any chemical contaminants, then you should be OK with just 20 minutes of chlorine contact time (ideally a contact tank) before use. You could be OK as high as 5NTU, I'd recommend getting a professional involved either way.

If you are supplying a reasonable size of village, I would imagine that central chlorination would be the best value solution.

*http://bit.ly/WHO-turbidity