Excellent item. Took care of all my algae issues. Powerful magnet so make sure you order the correct size. I have a 200 gallon saltwater aquarium, so I ordered the large magnet. SIMPLY AWESOME!!!!
If you have a larger aquarium, this is not the product for you. This did NOT clear the algae as stated. Mind you, my tank is very well maintained (180g saltwater) and I needed this product for simple "spot" cleaning. The product failed to clean the small amount of algae.