Check the listing for details. EasyPro Dry Rock & Waterfall Cleaner. Condition: New. Listed at 34.99 USD. Rock & Waterfall Cleaner quickly and effectively cleans rocks, waterfalls, pondless features, fountains, statues, and plant pots. This powdered formula brings powerful oxygen-based cleaning to large ponds or lakes as well as smaller koi ponds, water gardens and aquariums.Great for use with fish, birds, pets and wildlifeLifts debris to pond surface where it can be removed by net or skimmerWaterfall/Stream Application Turn off the pump and apply light layer of product. Apply 1lb of powder for every 300-400 square feet to problem areas, such as rocks and waterfalls. Wait 10-20 minutes before turning pump back on. Pond Application Heavy Dose: Apply 3-4oz per 1000 gallons of pond water every 2-4 weeks or as needed. Light Dose: Apply 1-2oz per 1000 gallons of pond water every 2-4 weeks or as needed. Allow 48 hours between consecutive applications. Avoid contact with plant leaves. Product may cause short term spikes in pH levels, so check pH before applying.Large Pond/Lake Application Treat no more than 1/3 of pond at a time. Apply 12-15lb per acre-foot of water. Double the dosage for problem areas.