Being on a lake in Oklahoma
and not really having any substancial growth problem to worry about. I get slime. I use a squeegee on a long handle while at anchor, along with a suction cup for my hand hold. Seems to be working. Two years now. Saves the paint too! I'm not into speed, just not wanting the bottom to be green when I painted it redish/orange. And not wanting the slime to hang around the water line while at the dock. It doesn't look so good and I don't like it on the dock, never mind on my boat. Keep it up, Ctskip