I bought these to replace the filter I have in my RV. The entire multipack was little more than a filter from an OEM or RV retail store. The water quality, on the other hand, is the same and the build quality of the filter itself is identical if not better than the more expensive filters I've used in the past. If you swap them out every 90 days, you're basically getting 4-packs of clean, filtered water for a year. Excellent value for money and quality. We've seen these things stop and I can't imagine NOT changing a new one often. At this price I can.
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