Cartridge, 25sqft,ht,2 SAE b,4-15/16,13-1/24oz. Clean regularly – Keep spare filters on hand. Refresh soiled pleated filters in ECO Soak #MT1015 or Power Soak #MT1014 cleaning solution. By keeping spares on hand, you can install clean filters now, while soaking soiled ones. After cleaning, set aside to dry completely. By rotating spares, they will last much longer, and you wont have to wait to use your spa or pool, saving time & expense. NOTE: Only pleated filter cartridges can be cleaned.