Airmax EasyKlear Defense 2-In-1 Algae & Weed Control takes the guesswork out of pond and lake treatments! Airmax EasyKlear Defense 2-In-1 Granular is easy to use, works fast, and provides long-lasting results. Works great in ponds, lakes, and even in areas with flowing water, such as a dock area or canal. Highly effective on floating and submerged algae, including Chara, along with a broad spectrum of submerged aquatic weeds. Use for total pond control of algae and aquatic weeds, or target treatment to problem areas.