Water filtration systems are typically a set of water filter elements which are placed inside housings and are used to filter water from different sources. A typical filter kit could consist of two or three filter housings and filled with different filter elements, such as
Sediment prefilter, carbon filter, sediment polishing filter
Sediment prefilter, carbon GAC filter, Carbon Block polishing filter
Each client will decide for themselves what combination of filter elements to use, based on the source of the water, and the desired usage of the water