When it is time to replace the UV bulb.

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When it is time to replace the UV bulb

 

UV bulbs from Emperor Aquatics need to be replaced after 11 months of operation.  If you shut down your pond for the winter, you may only need to replace your bulb once every 1.5 to 2 years.

When the UV bulb wears out, you will notice that your Koi pond will start to turn green or brown.  When you replace your UV bulb, the pond should clear up within a few days.