AquaClear Powerhead Pump Model 20 and 30 provides beneficial currents throughout the aquarium. AquaClear Powerhead Pumps enhance the biological capability and load factor for all aquariums. - Multifunctional Powerhead Water Pump - Creates Powerful Water Currents for a Healthier Aquarium - Enhance Water Flow through Undergravel Filters, Improving Filtration Efficency - For Freshwater or Salt Water Aquariums AquaClear Powerhead Features:- Air filter to prevent dust and dirt from entering water- ΓÇ£VenturiΓÇ¥ aeration feature provides additional aeration and greater air output than most vibrator pumps- Vertical/Horizontal Output Diverter provides total control of current, without loss of pump output power- Adjustable Flow Control allows precise regulation of output stream- Output Stem Adapter provides convenient attachment to flexible tubing, ideal to power other accessories such as protein skimmer. AquaClear Powerhead Pump Models 50 and 70 offer both forward and reverse water flow. The use of reverse flow through an under-gravel system promotes bacterial growth from the bottom up, increasing biological filtration capacity. The injection of water containing oxygen beneath the gravel bed helps to support superior conditions for beneficial bacteria. Substrate maintenance is facilitated by debris being located near the surface for easy removal. - Supports Efficient Filtration- Dependable Service- Flow Control- Reverse Flow Option- Aquarium rim attachment fits easily to all standard aquarium rims- Solid, durable, compact pump construction- Epoxy sealed motor- Hermetically isolated from water - fully submersible- Water movement switch controls reverse and forward flow- Fully variable output control suction cup bracket allows custom and deep installations- Noise suppressor air filter quietly removes airborne contaminants before they can pollute- Free floating impeller- ΓÇ£VenturiΓÇ¥ aeration device increases surface agitation and gas exchange efficiency- Output stem accepts a 1/2" (14mm) hose for remote water return AquaClear AquaClear Powerhead Multifunctional Water Pump - Powerheads