I live in Arizona and we have a huge pond (lake?) that is man-made close to downtown Phoenix. It's about a mile around and a great place to retreat from the city. But...it's without problems. We have had issues with golden algae and botulism over the past few years. I know that there is a regular usage of copper sulfate and I am fearful of continual use of such a product. I am told it builds up on the bottom and becomes toxic. I realize we need additional aeration but I also want to go to a natural form of adding good bacteria to our pond/lake but seem to only get quotes and little of the one/one help. If the product was so good...wouldn't they be using it in AZ? Wouldn't a salesperson review the problems before selling me a product?