Sediment filters are availble to fit all available housings and flows. The least expensive are the Poly-wound elements which are available in 0.5, 1, 5, and 20 micron. It should be noted that these filters offer “nominal” ratings. This means that they will filter at the specified rates for a “given ” time. After they have become saturated they cease to filter and allow untreated water to track through the filter rendering them usless.