Normally replace every 8-12 months and burnt out is when you can't see the blue glow thru the unit and remember to turn off during medication...Next question does a UV kill white spot in aquariums
there are 2 models of UV. 1) one where the tube is in a quarts sleeve which the water flows around and the other 2) where the water flows around the tube itself (the tube acts as the quarts sleeve), i feel that this also effects the efficiency of the lifespan of the tube
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