Greetings all. What is the best method or filter for shallow water filtering. In this case no fish are involved but just a water area for some land turtles. The water max depth will be no more that 4 inches are so. I have tried the lower priced repo filters but they seem to wear out quickly. But they did intake the water from the bottom and filter it out the top which seems like the perfect solution. Additionally, this is not a large setup like a pond but a much smaller configuration. Thank you for any ideas or suggestions you may offer. Kind regards.