Water Garden Treatments These are the products we carry. Algae Control for Water Gardens and Koi Ponds GreenClean Granular works through oxidation, breaking down algae cells on contact. Its organic chemistry immediately begins fighting algae blooms, releasing vital oxygen into the water body as it biodegrades. GreenClean Granular is ideal for algae growing on waterfalls and all types of water. Controls String Algae in Ponds and on Waterfalls Breaks Down into Water & Oxygen Can be Used All Season as a Preventative Treatment Works on Contact Eco-Friendly Chemistry & OMRI Listed Algae Prevention For water gardens and koi ponds. GreenClean Tablets utilize activated peroxygen chemistry, the same chemistry as GreenClean Granular Algaecide, in convenient, tablet form. GreenClean Tablets are ideal as part of a preventative algae maintenance program. Ideal for Preventing Algae All Season Unique Slow-Release Formula Alternative to Copper Chemicals Easy Application Great Anywhere Debris Accumulates