In-reply-to: <200212070605.gB765BCP025373 at otter_actwin.com>
I've used one for a couple of years and have been very satisfied with
it. It's easy to use and reliable. I think the reservoir holds around
50ml of whatever you want to dose. Big Al's has a good price on them
too.
Ricky
http://www.aquatic-plants.org