Small Pond 2500 Dispenser System w/ 2500 Gallon Packets SHIPS FREE! (11001-52451)
The 2500 Small Pond Dispenser System uses time release beneficial bacteria to treat any pond up to 2500 gallons in size. Refill kits are available for 500 and 2500 gallon ponds.
My wife and I were kind of skeptical of this thing when we got it, but after a few weeks of use things starting looking better in our pond. Now, after several months it's doing great and we just put a new packet in once a month so it's easy to maintain. We're satisfied with how well it's worked.