These big blue filter housings are used for point-of-entry (POE) filtration, typically residential. They can be used commercially with more flow rate than a standard-size filter housing. A lot of water can flow through a large-diameter filter housing, so it's used for a variety of applications. You can put a sediment filter, a carbon filter, or a specialty filter with ion-exchange resin or arsenic-reducing media in a Big Blue filter housing.
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