The disc magnet JBL Floaty Blade L is a very light magnet with high magnetic and cleaning power. Even stubborn coralline algae can be removed very well with the help of the blade. The Floaty Blade is sweet and sea water suitable. With the inside-celled operative part which floats at slipping the magnet, it never comes to scratches by stones on the discs that can be caused during use of the magnet. I've been using the product with or without blade and am very convinced of its cleaning power.
