looks to me that the previous owner ! or some theeving git has stolen the electric cable and end caps of the UV.

a uv is only like a strip light that sits in a clear glass sleve and the water passes over/around the light thus killing the algie.

im sorry but if you cant find the cables or the make and modle (yours could even be home made) then you may have to replace the whole uv unit.......could yours be one like these?
http://www.emwc.co.uk/products2.asp?...bcategoryID=30

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