King British Filter Aid (formerly Safe Water) – 100ml or 250ml

King British Filter Aid is a rich-source of friendly-microbes that will help you maintain better water quality. A weekly addition to your aquarium water will reduce harmful ammonia & nitrite, making the water safer for your fish. Regular use improves the development of the biological filter for clean, clear water. Use during aquarium set up, regular water changes and following the use of other treatments or medicines. For use in coldwater, tropical and marine aquariums. One 100ml bottle will enrich up to 900 litres. Available in 100ml, 250ml bottles. How to use: Carefully calculate the volume to be treated making adequate allowance for the displacement of water by gravel, rocks and equipment. Invert bottle gently to mix before use. Add 1 capful (4ml) of Filter Aid  for every 36 litres (8 gallons) of water. Dispense treatment directly into aquarium water. When starting a new aquarium or when using in a marine aquarium, use a double dose. Repeat treatment once a week, after carrying out water changes, after using fish medicines, and when adding new fish.   Product reference 17894-UK = 50ml 5017357000190 – discontinued Product reference 1000246 King British Filter Aid 100ml 8711231203246 Product reference 1000271 King British Filter Aid 250ml 8711231206056 Product reference 17937-UK = 500ml 5017357016405 – discontinued