Features: 1. Unclean water tanks can be harmful to the health of farm animals. The Water Purifier Cubes are ultra-absorption activated carbon blocks designed to help maintain clean drinking water for livestock. 2. The Water Purifier Cubes are made of honeycombed ultra-absorption activated carbon that helps filter dirt, cloudiness, and odor from animal water troughs. The solid composition contains no powder or impurities and will not discolor the water. 3. Safe for use with all animals, including fish and reptiles. Designed specifically for animal drinking water. 4. Easy to use: Simply place the cube into the water tank. Rinse with clean water before initial use. For maintenance, clean with mild soap and warm water and return to the tank. With proper care, each cube lasts up to 6 months. One cube treats up to 150 liters of water. Multiple cubes may be required depending on tank size. 5. Helps ensure clean drinking water for farm animals and aquatic pets. Note: This product is not intended for use with human drinking water. Notice: Color may vary slightly due to monitor settings. Allow 1–3 cm variation due to manual measurement. Specification: Material: Natural activated carbon, sepiolite clay mineral Size: 10 x 10 x 10 cm Includes: 1/2/4 (optional) x Water Purifier Cubes