These filter housings are used for point-of-entry (POE) filtration, typically residential but they can be used commercially with a higher flow rate than a standard-size filter housing. A large volume of water can flow through a large-diameter filter housing so it can be 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. Rather than installing a larger backwashing sediment filter, the Big Blue is ideal to remove sediment before a water softener or an aeration iron filter. The filter cartridges are easily removed and replaced as needed.