Quote:
Originally Posted by Ken07AOVette
Is there any way to kill them? Is the lake ruined forever?
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Nope unfortunately there is no way to stop them once they've entered a waterbody.
Only option is manual removal (scraping) just to keep them off the structure, but this only keeps them at bay, they will grow back.
Exposure to dry conditions for 30+ days will kill them, say on a boat or dock etc