Our best selling product is 100%  natural. This biodegradable product is hassel free, you just gently toss the sphere in your pond and forget about it.  Sphere ships complete with our 24/7 30 day PROFormula. 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 will biodegrade over time while in the bottom of your pond.