We purchased our first home last spring and we've got a pond in our back yard. It's 50 feet wide and 115 feet long (approx. 12,500 gallons). One end is rather shallow, only about 3 feet deep, while the other end is about 8 feet. It's fed by a spring and runoff from the neighbor's hay/corn fields and through the back of our horse pasture. The horses do not have access to the pond, however. We don't plan to use the pond for swimming, etc. but just as a nice view and something to fiddle with. When we moved in, the pond was frozen over. With the melting of the snow and the frequent rain showers in the spring, the pond was overflowing constantly through the overflow drain to a drainage creek. By mid summer, it would only flow over after a rain shower. That's when we started to have problems with unwanted aquatic growth. We had thick stringy/clumpy (filamentous) algae growing in the shallow areas of the pond. We tried raking it out but couldn't keep up. We tried some "good bacteria" to clean it up, but had limited successes. I don't know if we just didn't treat as frequently as we needed. Late summer, we also had problems with cattails growing around the perimeter of the deep end, and in the center of the shallow end. I don't mind a few on the edge, but they were overtaking a good portion of the pond. The pictures that were displayed when we looked at the house showed a nice clear pond. What treatments would you recommend for controlling both algae growth as well as cattails? Would bacteria or dyes work better? Do we need a separate herbicide for the cattails? The pond is frozen over again right now and we'd like to take action as soon as we can when it melts.