Do slow sand filters work with high-turbidity (cloudy) water?
Slow sand filters work optimally when treating murky or cloudy water with up to 10-20 NTUs (nephlometric turbidity units) in turbidity, removing most of this suspended material in the process. For higher turbidity levels, prefiltration is recommended. Blue Future Filters manufactures gravel up-flow roughing filters that can work in concert or stand-alone as a preliminary step in treating especially high-turbidity water, causing a 50% to 80% reduction in turbidity.
