I live in San Antonio, one of the top six cities in the US for water hardness, and have used different brands of filters. Ironically, I decided they were better based on the condition of my cat's water bowl. Other brands have had a hard, caked-on residue in their bowl for a week after rinsing and refilling their bowl. The only way to get rid of it was with a brush and some grease. Since using this brand I have noticed that when you rinse the bowl to fill it with clean water it leaves no residue. I can only attribute it to these special filters.
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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NANPU 1/2" NPT Air Drying System - 5 Micron Particulate Filter, 0.01 Micron Coalescing Filter, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl W/Metal Gauge
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