The product description says 0.5 micron, but if you look at the pictures of the different filter layers, you can see that the inner layer is 5 micron. When I installed the filter it didn't filter out the chlorine in the water, we could still smell and taste it. I also found that the flow rate was higher than the 0.5 micron filters I've installed in the past. Unfortunately I installed it in my caravan and checked too late to return the items. I went to Homedepot and bought a $30 0.5 micron filter which once installed filtered out the chlorine in the water as expected. FYI, 0.5 micron filters have a very small opening (1/8 inch) at each end of the filter where the water exits. This is a sediment filter only, NOT a filter for chlorine, lead or other unwanted elements!
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