Per Aquatic Eco the recommended size would be 40 watts, but some have gotten
good results with much smaller units. The 25 watt unit gives the energy
level needed as a new bulb, but all bulbs deteriorate with usage.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html


"Barry" wrote in message
ink.net...
Have 1200 gallons with a +/-900 gph pump.
What size UV light should I be looking at?
I've been told both 25 and 40w.
Are there brands that are suggested over others?