Update 3/28/19: Although some reviewers said these filters fit well on previous purchases, a more recent purchase did not fit their filter housings, my last purchase was in March 2019 fitted perfectly my housings and filter elements were identical in size to the used ones which I removed this time. --------------------------------------------------------------- - ------------------------------------------------ -- ----------- -------- I have used underwater filtration systems for many years and the current one uses these GE cartridges. The Revain price on these is very good and I find these cartridges do a great job with the first stage cartridge to remove contaminants from the water including rust, sediment etc and the second stage cartridge should be chlorine, Remove spores, mercury and others. villains out of the water. I can't really know if it does the job, but I do rely on the manufacturer's product claim and it's NSF approved.
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