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  • Results 1 to 5 of 5

    Thread: When to use UV light?

    1. #1
      koi808 is offline Junior Member
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      When to use UV light?

      I have a 750 gallon pond in almost direct sunlight. I have a shade canopy to cover most of it providing shade to the fish/water. I'm using a 25W UV light. I noticed that when I turn it off, the water quality (clarity) doesn't really change. Since I'm not having any algae issues with the light being off, is there any other benefit in having it on?

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    2. #2
      two_wheeled is offline Senior Member
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      Nope! If your water is clear and you don't have green algae, you don't need to leave the UV light on.
      -Steve in Phx.
      Novice Extraordinaire

    3. #3
      BAVOTOI is offline Supporting Member
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      Just leave UV light on. It's don't hurt anythings.

    4. #4
      Grumpy is offline Senior Member
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      I only turn on my UV when/if green water appears, usually in early spring. The UV bulbs only have a limited operational life to kill algae (they will emit light longer, but not sufficient UV), so I keep mine off until they are needed.

    5. #5
      BAVOTOI is offline Supporting Member
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      Hey bro my koi eat algae in winter. My UV's on just control green water.

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