AquaForte Chamber Filters Easy to install chamber filters with various filter media such as: Japanese mat, coarse foam, fine foam and bioballs. The foam cartridges are easy to clean by squazing them (Models 200&350) or with a special tool (Model 550). The models 350 and 550 are compatible with the AquaForte GUV series UV-C lamps. The max. pond volumes are without fish. For ponds with fish you must reduce the capacity by 50%.