Wet/Dry filters are a must for any aquatic ecosystem, they enhance biological filtration as well as mechanical filtration with the proper pump they will cut down maintenance time and do a much better job than traditional filters including canister filters. This Pro Clear Aquatics unit includes Bio-Balls, a polishing block, siphon hose, return valve and all tubing. These filters work for freshwater or saltwater tanks. (Overflow sold separately) 

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Model 75 and 125 use Single Output – Item # 675128

 

Model 175, 200, 300, 400 use Dual Output – Item # 675135