I have a small, 100 gallon pond in my backyard. The weather is warm since it is summer and I am using a charcoal filter on my pump - the same as a friend who has the same size pond in her own backyard. I am having issues with needing to clean the pump anywhere from two to four times daily, while my friend only has to clean hers once a day, sometimes two and three days can pass and it's fine. I wouldn't worry about it, and would just turn off the pump all together, but I have 7 fish (comets) that I have become oddly attached to (yeah, I know that sounds crazy). I don't like cleaning the pond so many times daily. And, I am going away for a week in the beginning of September. I will have someone here who will be able to clean it once a day, but that's it. If anyone could recommend a good filter, I would be very appreciative. Also, how long can seven decent size comet fish (they are still young -- and between two and three inches each) survive if the pump is plugged up? Or if it's just unplugged until sufficent cleaning can be done?