Let Bioverse ship your AquaSpherePRO maintenance supplies once a month. Every month, your new shipment will arrive. All you need to do is simply place the 100% natural AquaSpheres into your water when your shipment arrives. It‘s the same great product with less hassle, you just gently toss the sphere in your pond and forget about it. The best part is our new sphere is completely sustainable as well. Sphere ships complete with PROFormula. Will treat fresh water ponds and lakes for up to 30 days. Remember to add your new spheres 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.