On Fri, 09 Jan 2009 18:58:49 +0000, Gordon wrote:

http://www.ultrasonic-antifouling.com/

Only needs 1 amp 24/7
Gordon

I had a look at the site referenced above and a couple of things come
to mind.

First of all the site seems to talk ONLY abut algae and never about
barnacles or other kinds of shell fish.

Secondly, I have an inside mounted depth sounder with the transponder
epoxied to the inside of the hull - very similar to the installation
of the system described in the reference URL. I have never noticed any
decrease in growth on the hull from using the depth sounder.

Finally, as the entire system consists of a transmitter and a power
supply generating ultra-sonic pulses the price of GBP 700+ seems
extremely high for the electronics involved.
Cheers,

Bruce
(bruceinbangkokatgmaildotcom)