Hello from Ca. I'm in the planning process with my pond. My pond is going to be about 1500 gallons I have ordered the liner and the pump. I'm trying to decide on a UV light and filter. I'm looking at a Pond Pressured 13w Filter UV BIO-FILTER 1500gal Pressurized on Ebay. Is a pressurized bio filter with a UV light a good idea?? I'm so confused when it comes to the filter. Thanks Rebecca