Eshopps WD-100 Wet Dry Filter 100 24x12x16Sometimes the best way to move forward is by sticking to tradition. The ESHOPPS WD 4th G. sumps did just that. Redesigned to make it even more perfect for your freshwater aquariums with huge bio load such as cichlids or large fish and works great for your saltwater setup. It uses the proven traditional method of wet and dry biological filtration via Bio Balls. The 4th G.s new design promises you ease of use and effortless maintenance. The WD 4th G.