Honestly I've tried several 4.5x20 5micron carbon filters but this one has had the best flow rate out of all of them. Most importantly the water tastes great. I use two of these on my commercial system and they work great. I tried them before about a year ago and then tried alternative ones that were cheaper; but just because of the flow rate I would say these are worth it. I'd say I get about 50,000-60,000 gallons before needing to change them.
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