This depends on many factors. If the vessel has a clean hull then your results will be noticing no growth. However if your system is heavily fouled with algae and barnacles, the algae and barnacles will begin to die off within a few days of use however the algae will only begin to actually fall off when the boat is underway, a regularly used boat will generally clean its hull off within a few weeks. Remembering that the hard bond pre-existing barnacles can exist beyond their death and they can then remain until the are scrubbed or scraped from the hull. It is generally advised, to achieve best results, if the hull is heavily fouled it should be scraped / scrubbed at the time of the Ultrasonic Installation.
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