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Every hobbyist wants to create the best environment for their fish to live in. Incorporating a UV sterilizer unit is one of the best steps taken in creating a clean healthy environment for fish.
In order to maintain the most optimal levels of effectiveness with your UV unit, and to care for your water environment, UV bulb's should be replaced once a year. UV bulbs needs to be replaced annually even if the bulb is still emitting light. UV bulbs need to be replaced in order to maintain the intensity of the light. UV light units need to constantly emitted strong levels of UV rays in order for the unit to do its job properly.