Waterlife Parazin P is a one shot treatment for Fish lice (Argulus) anchor worm (Lernea) water tigers (Odonata) and gill maggots (Ergasilus). These are just some of the horrific parasites / predators which can attack fish in garden ponds at any time and are almost invisible to the naked eye. New one-shot Parazin P destroys these and other insect and crustacean pests in garden ponds. **Do not use simultaneously with other disease treatments** - Destroys insect and crustacean predators/parasites. - A single dose is all that is usually required. - \"Easy to use\" tablet form. - Safe with fish plants and filtration bacteria. 200 tablets (22500 litres) Also available in 80 Tablet pack.