Third order they are great, don't connect filters faster than 5 or 10 micron and filter much better. There is fine silt in our well water. I've tried many different ones, carbon etc. We have reverse osmosis for drinking etc. The pre-filters for that last method also last longer. If you really want clear water and catch a lot more, this is the way to go with progressive density so they don't clog up faster.
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