Our cube is an ultra-absorbent activated carbon block built in a honeycomb-like structure that effectively purifies and cleans the water in your animals' water trough. Provide clean and fresh drinking water for your livestock without having to constantly change the dirty and turbid water in the trough! OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.