White-Rodgers F825-0494 activated carbon impregnated foam filter. The carbon absorbs odors and fumes and should be replaced once or twice a year. Replace more often if exposed to cigarette smoke. The filter measures 17½ x 16½ x ¾".
One carbon filter is used in the SSC1000, 10C18E-410. The SSC does not use a prefilter. Read cross reference below.
This carbon postfilter will show premature dust if there are problems with your air cleaner. Or provide proof that the air leaving the cells is dust free. The filter can also reveal if your cells need more frequent cleaning