The AS200 system has filter housing with cartridges inside that are replaced every year. The housings need to be unscrewed, the cartridges removed, housings cleaned and new filters installed. The system is also a little larger than the AS2200.
The AS2200 has no filter housings to be removed, the filter and housing are all one, simply unscrew the filter, throw it away and screw in new ones. Changing filters is very simple and easy and takes all of 2 minutes. The unit is a little smaller than the AS200.
Both systems take various filter options however the AS200 system does have more filter options for removal of specific contaminants.