First, I have the reviews here compared with the manufacturer's instructions and then reminds me of my chemistry lessons. On the whole, the effect of the amount of water above the sludge layer and the temperature of the water depends. So the water has been lowered in the 400 square meter pond to 10 cm above the sludge layer. This rose in sunlight and the temperature of the water. Neat dosed according to instructions and put it on the water. If you look determines how this white stuff slowly sinks to the bottom, while also partially slightly bubbling. So far so good. The next day, then float around in there first dead filamentous algae on the water surface. Three days later, there were significantly more filamentous algae and the water turned a murky brown. Despite the brown water stain the fish were alive and kicking. So what was happening. One week later, the water is still cloudy, but to flourish in the mud half-choked lily suddenly started! The beginning of August! A test rod, placed on the water to mud top, disappeared into the now semi-liquefied slurry. A fixed limit as before is no longer discoverable. The formerly solid sludge is in the constitution of a thicker gravy, so what's going on! The application is now 12 days ago and the Planzen in water to life, filamentous algae are considerably less and from the solid thick mud is significantly thinner broth gewurden. More I can not say this at the moment, but that something positive happens you can already now. I hope now to the manufacturer's instructions - some three months Penetration - and will continue to monitor. To date, I'm with the by airing effect - because it is more in the chemical sense is not - fully satisfied.