Great for increasing oxygenation and circulationIdeal for deep gravel beds and undergravel filtersPerfect for small aquariums and turtle or amphibian tanksHelps your undergravel filter stay cleaner and operate more efficiently. This kit converts any Penguin Powerhead to reverse flow. Allows filtered, oxygen-rich water to be pumped down through your lift tube and underneath the undergravel filter plate. Bacteria are encouraged to grow from the bottom up, where it's less likely to be disturbed, while debris in the gravel are pushed into the tank where your filter can remove it. Also great as a pre-filter on a powerhead used for circulation. Only for use with Penguin Powerheads, not included.Please click on "More Information" for installation and maintenance.Sponge Pre-filter Kit Contains:-->Pre-filter Core and Adapter replaces standard power head strainer to adapt to pre-filter sponge.-->Replacement Pre-Filter Sponge for the Penguin Powerhead Reverse Flow Filter Kit. Open cell Sponge Pre-filter traps more dirt, protects against impeller damage, and prevents heavy waste buildup in gravel bed and its reusable.1/2" Straight Barbed Adapter connects to 1/2" tubing to create dramatic waterfall effects.Air Inlet Plug protects fish and helps ensure 100 percent reverse flow.Reverse Flow Elbow fits virtually all-larger diameter undergravel filter lift tubes.-->Installation:If you are converting a powerhead you are currently using, unplug and remove the unit and carefully clean. Remove all parts except the motor housing, impeller assembly, and impeller housing.Slide the Sponge Pre-filter over the core as far as possible. Core and Sponge slide onto the bottom of the impeller housing. The Reverse Flow Elbow slides over the outlet and the Air Inlet Plug is installed. Failure to use the Air Inlet Plug can cause water to be forced vertically out the air inlet when backpressure is present.Installing the Powerhead back in the aquarium: The converted Penguin Reverse Flow Powerhead is in

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