Filter just fine. They are not easy to install, not the fault of the PTR, but the fact of their appointment and use. The filter canisters are filled with water (unless you have a drain valve and they will drain through a 1/8" hole forever) and the filters inside are equally filled with water, filtering out any contaminants that settle in the water were. As a result, they are heavy. The O-ring may break when unscrewing the housing, but that's not the filter's fault.
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