User:Bert styx 28

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my name is Bert Norris i am 83 years old engineering background i have a pond in my garden with fish,a couple of years ago i bought a Hozelock Cyprio filter box i took it home put it away when I decided to fit it into my pond system i found out that the ballast unit plus electric lead was missing so i want to know how to calculate the kind of ballast unit I need I know the UV lamp is 6w on the label it says mod 1347-oooo ecopower 2200 230v 50hz  1 x max 11w is there any kind person who can advise me please