The TMC Pro Clear Ultima 55 watt uses ultraviolet light to destroy the green single-celled water borne algae which make garden ponds murky and unattractive. As no chemicals are used there is no danger of pollution or over treatment of the water and sensitive plant and pond life is not affected. At the heart of each Pro Clear Advantage unit is an ultraviolet lamp sealed inside a quartz sleeve. As water is pumped through the unit ultraviolet light from the lamp destroys the algae leaving the water clear. The Pro Clear Advantage UV55 is suitable for ponds up to approximately 45000 litres/10000 gallons and uses 1 x 55W TM HF PRO UV Lamp. - Professional ultraviolet pond clarifier suitable for larger ponds particularly Koi ponds. - Surface filter or wall mountable (using supplied mounting brackets). - Suitable when high flow rates are needed the UV55 has a maximum flow rate of 4000 gallons/18000 litres per hour. - Quick and easy to maintain. - Unit has four 1 1/2\" BSP female threaded ports giving two inlet and two outlet options. These can be connected to flexible or rigid pipework and water can enter/exit unit either vertically or horizontally (or a combination of both) offering maximum flexibility with pipework configurations. - Supplied with universal hosetails for flexible pipework which glow to show that the UV lamp is working. Dimensions (w x h x d) 93cm x 28cm x 12cm.