Standard Canisters include most two-piece plastic canisters with 10-inch and 5-inch tall sumps. Cartridges are 2-1/2 inches in diameter.
Jumbo Canisters are similar to standard canisters, but use cartridges with a diameter of 4-3/4 inches.
Everpure Filters- Everpure makes a filter unit that includes a head and a replaceable screw-on cartridge. These cartridges fit the Everpure filter head.
Omnipure Q-Series Filter - Omnipure makes a compact filter unit for under-sink applications, and these cartridges fit that unit.
Hydro-Life/Aqua-City are two common brands of in-line, under-sink filters. These cartridges are exact replacements for those name brands.
Alpine and Alpenlite RVs are outfitted with water filters that are non-standard, and until now, owners had difficulty finding a reasonably-priced replacement unit. We now have a well-built solution to this problem.