Safe with live fish and plants in ponds and water features Effective against green water, slime, blanket weed, string algae Removes brown colour tannins caused by leaves in water Maintains algae free ponds - helps control fish disease Activated by water it immediately starts killing algae blooms Releases vital oxygen into the water as it bio-degrades1 kilo will treat up 50,000 litres of water Powerful Oxidation Reaction Acts as barley straw but with many times the strength and with immediate effect - no waiting for weeks to see results. Hydra Pond Clear provides effective control of all types of algae, including stubborn blanket weed and string algae, whilst raising the oxygen level of the water. Use in all water features including water gardens, fountains, and bird-baths or as a surface treatment. Algae Toxins Hydra Pond Clear is used to eliminate the toxins produced by blue / green algae that presents risks to humans and animals. Elimination of blue / green algae is also aesthetically import for lakes and ponds in residential areas and on golf courses - even if they are not designated as sources of portable water.Time Saving Hydra Pond Clear is your personal pond cleaner in a tub, eliminates the usual time consuming and fish stressing job of emptying and manually cleaning your pond. This long process can be eliminated by simply treating your pond once monthly with Hydra Pond Clear. Safe for Fish & Plants Administer when growth first appears. Hydra Pond Clear is safe for fish and plants when used as directed. Use from 4°C to 35°C degrees water temperatures.