Sediment Cartridges		These cartridges remove particulate matter from your water, and should be used as the first stage of any filtration system. They both clarify your water and protect down-stream filters and plumbing from premature failure.
Carbon Cartridges		Activated carbon does a remarkable job of improving the taste and odor of water. These cartridges should be used as the second stage in a filter system. They are commonly used by WaterPur for a whole RV filter.
Combination Cartridges		Combination cartridges combine both sediment removal and taste-and-odor improvement in a single cartridge. Ideal used with a single external canister, they provide a good compromise where space does not permit two canisters.
Specialty Cartridges		A variety are offered and depending on flow rate, these filters may be good in multiple outside systems or in the kitchen at point of use. This style of cartridge is used quite often by Hydrolife and Shurflo filter systems.