The Algae Scraper with Handle by Aqua One allows you to clean off the toughest and grimiest surfaces in and around your aquarium, ridding the glass of stuck-on algae and dirt. While using the sponge provided; an up and down scrubbing motion will quickly make the algae disappear. After use, a hook on the opposite end allows you to hang dry. One simple tool can help you handle your aquarium cleaning-duties way easier than ever before! Use only on glass aquariums and is not intended for use on dry surfaces.