Someone is trying to sell a friend of mine an ultrasonic device to eliminate algae. Anyone ever heard or tried one? They are selling it for around 1200 bucks. He has about a 1/8 acre pond 8 feet deep with a liner..
I just found this on the internet.
Ultrasonic Algae Control Benefits include:
Environmentally safe!
Chemical-Free Algae Control!
Kills algae: planktonic algae, blue-green algae, green algae, filamentous algae, etc.
Reduces TSS counts in the effluent of wastewater treatment facilities
Does not harm "beneficial bacteria, aerobic or anaerobic"
Kills root parasitic fungi like Pythium and Fusarium(in water)
Does not harm humans, animals, fish or plants
Reduces chlorine use in swimming pools, drastically
Removes bio-film: Boat hulls, swimming pools, tanks, cooling towers, etc.
Low power consumption (from 20 to 45 watts)
Virtually maintenance free (wipe off the transducer face occasionally)
No moving parts, No filters to clean, No bulbs to replace
State of the art electronics signal transmitter
Transducer made in USA "exclusively" for LG Sound algae control devices
Easy to install (GFCI outlet on 120 volt household current)
2 year manufacturer's service warranty
Continued support by AlgaeControl.US and our Dealer Network
Affordable pricing and saves you time so you may enjoy your water!
The Ultrasonic Algae Control Transducer:
The ultrasonic transducers (underwater speaker part of the unit) have the widest output scope (176 degrees) and range (up to 150 meters for roaming algae and up to 400 meters for blue-green algae) making it the most effective ultrasonic transducer in this field. LG Sound has the exclusive worldwide sales rights for this valuable part of the LG Sonic family of ultrasonic algae control products so you will not find it in any other device of this type.
How Ultrasonic Algae Control Works:
The LG Sonic unit transmits a complex pattern of ultrasonic vibrations through the water in an all around radius of 176 degrees causing the vacuoles inside the algae cells to resonate and break, much like a glass breaking from a high pitched sound while the same vibrations are harmless to humans, animals, fish and aquatic plants. Once broken, the algae cells no longer possess the ability to grow and reproduce. Now your water systems will become clearer and healthier from destruction of algae and other harmful root-parasitic fungi (single-celled) without having to apply environmentally harmful chemicals for this purpose. The microscopic pictures below clearly show the ultrasonic effects on heathly, dying and dead algae cells.

In Dog Beers, I've had one.