
AP420 anti-hot water/scale inhibitor filters are attractively priced, but it's too early to judge their effectiveness. I replaced the existing filter about a month ago (October 2021) and will be replacing it in 12 months. The filter is used to supply hot water in the "summer house" and has been in operation in this form for almost half a year.

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NANPU 3/8" NPT Compressed Air Filter Regulator Combo Piggyback, 5 Micron Brass Element, Poly Bowl, Semi-Auto Drain, Metal Bracket, 0-150 Psi Gauge
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Filter under the sink Aquaphor Favorit ECO silver
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NANPU DFR-02 1/4" NPT Air Drying System - Double Air Filters, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl
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