UV Clarifier, Vitronic 18W UV by Oase (

Simply connect the appropriate size of the Vitronic clarifier between the pond pump and the pond filter. The power of the built-in UV lamp destroys the cell structure of floating algae and thus effectively prevents growth.
18 Watt Uv
Dimensions: 21″ x 7″ W x 5″H       Cable length: 16ft.
Voltage: 120V/60Hz    Warranty; 2 year
Number of inlets: 1  Inlet connection size:  1″ , 1 1/4″, 1 1/2″
Number of outlets: 1  Outlet connection size:  1″ , 1 1/4″, 1 1/2″
Max Flow Rate: 925 gallon
Suitable for ponds up to 5283 gallons without fish      2642 gallons with gold fish           1320 gallons with Koi