A. Features: 1. An unclean water tank may be harmful to the life of farm animals. The Water Purifier Cubes are Ultra-Absorption Activate Carbon Blocks that can help maintain clean drinking water for farm animals, reducing the trouble of constantly changing cloudy water. 2. Water Purifier Formulas: The Water Purifier Cubes are made of Honeycombed Ultra-Absorption Activate Carbon Blocks, which can effectively help filter dirt, cloudiness, smell, etc. in livestock troughs. They have a solid composition, no powder, no impurities, and do not cause black water. 3. Safe For All Animals: The Water Purifier Cubes are specially made to provide clean water for various animals, including fishes and reptiles. They are safe for use with animals only. 4. Easy to Use: Simply put them in the tank. Wash them with soap and warm water, and they can be put back in the water tank again. It is advisable to wash the cubes with warm water before use. These cubes are long-lasting with maintenance, but it is advisable to change them every 6 months to help ensure clean drinking water for animals. One cube works for 150L. Depending on the size of the tank, a few blocks might be needed. 5. Ensure clean drinking water for farm animals or fishes with Water Purifier Cubes today. (Note: This product does not work for humans' drinking water.) B. Notice: 1. Actual color may be slightly different from the image due to different monitor and light effects. Please allow 1-3cm deviation due to manual measurement. C. Specification: Material: Natural activate carbon, sepiolite clay mineral; Size: 10*10*10cm; includes: 1/2/4 (optional) x Water Purifier Cubes D. About Shipping: All items will be shipped within 3 business days after payment is received. Most times you will receive them within 8-12 days. The specific delivery time depends on circumstances. E. Any questions, please feel free to contact us. During the shopping process, if you have any questions, please feel free to consult us, and we will reply to you within 24 hours. Wish you a happy shopping. Thanks for your cooperation, and we will try to make you feel satisfied.