Otoh, if one hasn't done a water change in the last 2 weeks or more, a
20-25% will help (assuming one is using city water and not irrigation or
well water with high nitrates). ~ jan

On Sun, 30 May 2004 01:25:18 GMT, "RichToyBox" wrote:

Let the uv do its thing. Adding lots of new water just helps grow lots of
new algae. The bulbs do lose intensity over time. Some say as much as 40%
per year, and that means the effectiveness the next year is pretty low to
get the same results as last year. Give it a week and see what happens, and
if it is not clearing, then buy a new bulb.

(Do you know where your water quality is?)