Hi all. Recently drained out all the water from my 2,100 gallon pond. It was time to get all the sludge and leaves out. So that job is finished, and the fish are back in the pond. But, of course, all my algae died and I am needing to do water changes. But I have this chemical that neutralizes all ammonia and nitrates. Or so it says. Also says that its completely harmless to all aquatic life. So I was just wondering if a person could safely use that stuff, instead of doing water changes. Anyone know? Or should I still do the 25% water changes? I must admit that I don't even know how long you are supposed to carry on with the water changes.