I've used GreenShield for 10 years. It's great for killing algae & fungus on
just about any surface. It's chemically similiar, if not identical, to
Physan and most of the chemicals sold as pool algicides. I haven't checked
out the exact formulas, but I know I haven't had any toxicity on any plants
hit with the GreenShield or Physan at algicide levels. Most are quartenary
ammonium compounds. I also haven't had any skin problems when working with
them without gloves. I wouldn't be without these.

"Ray @ First Rays Orchids" wrote in message
...
If you leave the stuff there, it just provides a breeding ground allowing
it
to spread.

I am not aware of any chemical remover that wouldn't harm your plants as
well.

I pressure wash the entire GH to remove it, and then try to remember to
spray with 1% bleach about monthly as a preventive measure. I recently
bought some "Greenshield" which is supposed to be really effective and
last
longer between applications.
--

Ray Barkalow First Rays Orchids
http://www.firstrays.com
Secure Online Ordering & Lots of Free Info!


"Gene Schurg" wrote in message
rthlink.net...
I'm getting algae growth in the greenhouse. The glass is easy...I just
squeegee it when there's condensation on it. My problem is on the
aluminum
and brick.

Should I worry about it? What should I use to get rid of it?

Gene