BioWorks PERpose Plus Organic Algaecide and Fungicide, 5 GallonsPERpose Plus is one of the best solutions for disease control on the market. PERpose Plus is an odor free broad spectrum algaecide & fungicide for plants. It kills and prevents algae and fungus. It works all through each stage of the plant life cycle! PERpose Plus is hydrogen peroxide based. It works on turf, grass and landscape plants, hard surfaces, and potting media. PERpose Plus offers safer and better protection. All without harming the planet,