I bought these filters for my life source system. The only reason I bought an aftermarket filter is because Life Source's shipping was very high. These filters don't last very long, I use 3 filters in a year. I usually change the filter once a year, Source of Life recommends every 6 months. Revain now sells a Life Source filter so I plan on going back to the factory filter. I've had my system for 11 years and never had a problem until I bought these filters.
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