As the first company to use hydroponics in pond keeping, we realized that adding dirt to an enclosed ecosystem created multiple problems: dirt can be washed away by pond water or rooted out by Koi; and dirt can introduce “bad” bacteria to your eco-system. We solved most of those with the development of our SPMTM. Additionally, SPMTM leaves lots of surface area for nitrifying bacteria to grow on, especially when seeded with our Bio-SeedTM. SPMTM biodegrades, and when you add our Sludge AwayTM Bacteria, there is no mess left on the pond’s bottom.