Features:1. The unclean water tank is harmful to the life of your farm animals. Say goodbye to the trouble of constantly changing cloudy water tank. The Water Purifier Cubes is an Ultra-Absorption Activate Carbon Blocks that can maintain clean drinking water for your farm animals.  2. Water Purifier Formulas: The Water Purifier Cubes is made of Honeycombed Ultra-Absorption Activate Carbon Blocks that can effectively help to filter dirt, cloudiness, smell, etc. in livestock trough. Solid composition, no powder, no impurities, and does not cause black water.  3. Safe For All Animals: The Water Purifier Cubes is specially made to provide clean water for all animals, including fishes and reptiles. It is safe for use for animals only. 4. Easy to Use: Simply put it in the tank. Just wash it with soap and warm water, and you can put it back in the water tank again. Wash the cubes with warm water before using. These cubes are long-lasting with maintenance but advisable for a change every  5 months to ensure clean drinking water for animals. One cubes works for 150L. epending on the size of the tank, a few blocks might be needed. 6. Ensure Clean Drinking Water For Farm Animals or fishes with Water Purifier Cubes Today Get Yours NOW(Note: This product does not work for humans" drinking water.) Notice: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Specification: Material: Natural activate carbon, sepiolite clay mineralSize: 10*10*10cm includes:1/2/4(optional) x Water Purifier Cubes