Our best selling product, 100% natural. This natural pond algae control is designed to prevent pond issues before they arise, promoting pond health. This biodegradable product is hassle free, you just gently toss the sphere in your pond. Sphere ships complete with our 24/7 30 day PROFormula. Our outdoor pond supplies will treat fresh water ponds and lakes for up to 30 days. Remember to add a new sphere to your pond EVERY 30 DAYS to continue to treat throughout the pond season (water temperatures from 45 degrees and above). You cannot over treat water but under treating may not yield desired results. The whole sphere, outer shell and inner contents, will biodegrade over time while at the bottom of your pond.The AquaSpherePRO works by consuming the excess nutrients in the pond, eliminating unwanted organic matter and preventing pond issues which can arise at any time. If the nutrients are not available for growth, the growth is unable to develop. It is an amazing all-natural pond maintenance product for season long care, and will not hurt plants, animals, or humans.