Hi,I have a 5000 gallon pond and have a 55 watt uv but am changing it for a uv suitable for 15000 gallons because my pond is in full sun all day and my current unit can't cope. An oversized uv will also lower the bacteria level in the pond which has a benificial effect in that it will reduce any bad bacteria in the pond,your good bacteria in the filter will be unaffected.
Tony
Posted on Oct 10, 2005, 4:36 PM from IP address 81.158.40.115