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.
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