I agree with Fabio. I have a 2005 170 CC which has been in the water for two months. I have used it 5 times this year and each time performance diminishes due to an increasing number of barnacles and algae growth. Performance was way down the last outing. She's now in the driveway, the bottom is completely covered in barnacles. A modest pressure washer takes care of the algae, but the barnacles are more persistent. A few days of drying followed by a few days of scraping removes them but it's an awkward and time consuming process. Definitely recommend a boat lift or using your time to bottom paint instead of scrape barnacles.
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For anyone who thinks the barnacles "pop right off" take a look at the photo. This is after pressure washing with a 2100 psi machine. I think this might be what Mud Runner refers to as
UGLY.