Two of these have been working consistently on our well water for 3 months to remove all sulfur smell and taste. We live in Southwest Florida and our well water is insanely high in sulfur and iron. I tried the cheaper cartridges and went back to these iSpring cartridges because the inexpensive cartridges only last 7 days compared to the 90 days that iSpring cartridges last. Our fountain has a 40/60 pressure switch and these cartridges have a very low pressure drop. Very happy with them and recommend them to everyone. They work perfectly.
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