Check the listing for details. EasyPro Liquid 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 commercial strength liquid formula brings powerful oxygen-based cleaning to large ponds or lakes as well as smaller koi ponds, water gardens and aquariums.Safe for use with fish, birds, pets and wildlifeLifts debris to pond surface where it can be removed by net or skimmerSimply pour into the area with the most active water movementApplication Apply 1oz per 300 gallons of water once per week, or up to once every 3 days for problem ponds. For best results, apply in the morning under sunny, calm conditions. Product can be mixed in a bucket of pond water to spread evenly around pond or fountain. Use when pH is between 7.0 and 8.0.