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Couple of things here. Firstly, slow sand filtering may not be that easy to set up properly and if it is not, may develop short circuiting and fail to remove the v fine suspension. Slow sand filtering also comes with maintenance requirements that again will lead to failures if not implemented properly. I recommend talking in detail to specialists such as Dryden Aqua or similar (I have no affiliation to any suppliers) before moving forward with anything on the ground. Secondly, you have not said anything about why the water is turbid in the first place. Is it possible to determine the cause (and if necessary change the abstraction / collection systems to decrease or eliminate the problem at soure)? A small investment in testing could also shed light on the composition of the turbidity and allow an assessment of its likely impacts on consumers. I appreciate milky water is not ideal, but if people can be reassured that it is clean and not toxic, that is better than clear water that is not! Hope this is helpful.