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More on ultrasonic algae control
I actually came here as I was doing research on ultrasound use for anti fouling on boats and it's been interesting in following this conversation.
First I wanted to share my personal experience with these devices. I'm not involved with boats but I do work in controlling algae blooms in ponds and industrial applications like cooling towers, waste water, etc.
Ultrasound has now developed to the point where it will control most algae types very well...not all of it but probably anywhere from 70 to 100% depending on the species. In industry it works best by controlling biofilm, which may apply to boats too. We have to start with a clean surface but once this is done and ultrasound is applied, it works pretty well. The tricky part in these settings and I think boats would be the same, is figuring out how to mount it in such a way where it can get a clean shot at most of the hull area.
So all in all, I see no reason why this shouldn't work for boats. I don't know about vendors for boating applications (we don't do that, nor am I intending to make this into a commercial post) but I've found for our customers that it's best to offer them a 3 month trial so it will either work or it won't. It's on a rental basis and if it works, they can pay off the unit, and if not, send it back without any additional fees. I think this would be worthwhile for any serious supplier of the boating industry so it's something worth checking on. For what it's worth we have about a 70 to 80% stick rate where the trials are purchased so that's pretty good overall in my opinion.
Anyway, if someone should have any questions that I can answer, I'm happy to do that, but again, I'll only discuss the technology and my experiences with the it. I've not talked about any advertising or commercial intent with the owner of this forum and I intend to respect their policies in regards to those things.