As Robert Kourik points out in Drip Irrigation for Every Landscape and All Climates, “without a good filter, the [drip sites] can clog, rendering your investment of time and money useless.” No matter your water source (even municipal or clean well), you must filter it for drip irrigation. Routine cleaning of the filter is important, and extraordinarily easy with this filter: simply unscrew the shell that houses the filter, pop it out, and use a toothbrush to give it a quick brushing. 200 refers to the fineness of the mesh.
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