The AquaSpherePRO is an all-natural and eco-friendly time-released dispensing system that introduces beneficial bacteria and enzymes into the water, which helps to reduce excess nutrients and breaks down organic matter that clouds water. The AquaSpherePRO is designed to prevent issues in pods before they arise. Cleanup safe and easy. It is important to add a new sphere to your pond every 30 days throughout the pond season (water temperatures 45 degrees and above). It's also important to use the correct treatment size for your specific water feature. You cannot over treat water but under treating may not yield desired results. This veterinarian-approved product is safe for livestock, wildlife, plants, pets and people, keeping your water clean in an environmentally friendly way.