The AllPondSolutions UV Light Steriliser has a unique design which feeds the water through a special helix, meaning the water does not just run through the UV but spins inside, allowing the UV more exposure before the water exits the outlet. This form of sterilising enables increased efficiency from a more-even exposure of the water to the UV. This improved UV system, the Ultra Violet Clarifier, continues to be a key element of a well filtered clear water system. Unlike other sterilisers, this unit has three inlet / outlet's - very useful if you want to run the output to a two-fall waterfall, or indeed a waterfall and a filter. The unit comes complete with three stepped hosetails to fit a variety of hose sizes. The UV clarifier also has a transparent centre panel enabling you the to check that the UV is fully operational at all times. The sterilizer is also supplied with a separate glass viewport which can be used to replace one of the hosetails for use as a one-in / one-out unit.