Above is a Sta Rite System 3 Cartridge Filter-NOT to be confused with the System 3 Cartridge DE filter. The difference is the cartridge itself-the D.E. cartridge has less pleats and a more porous covering material that holds the D.E. powder filtering media,while the cartridge above has a denser material that IS the filtering media. The above filter has a 10 year tank warranty and a 3 year cartridge warranty and comes in up to 500 square feet filter area-you could go a whole season without ever cleaning!
Cartridge filters filter to around 15 microns but get better as they get dirtier,filtering down to 5 microns. Here are a few advantages to these filters:
1)No need to clean up messy D.E. powder (also a little more environmentally friendly as no D.E. clogs up sewer and gutter systems)
2)Cartridge filters have much more surface area than D.E. or sand filters so they need to be cleaned less often.
3)Many of the new pumps filter on low speed,which makes these filters even more efficient(smaller micron size of particles filtered out)
In fact,for many people,a cartridge filter system would probably be the better choice over D.E. During the day,its hard to see the difference in water clarity between a cartridge and D.E. filter system,but at night with the pool light on,you may see more suspended particles with a cartridge system. This can be reduced by a adding a water clarifier(polymer that gathers smaller particles together into a bigger particle than is easily filtered out)to the water and/or running pool pump at low speed.
Above is the Trident Pool King Filter,which can be used with regular or
D.E. cartridges up to 450 square feet of filter area...D.E. cartridge
shown which has less pleats. Below is a cartridge made by Filbur
Manufacturing which is made with Microban anti-bacterial protection
which helps protect against molds,yeasts,fungi and bacteria that can
cause odors especially in spas.