I am a new member from over the weekend and wanted to start a new thread so I don't clog up the introduction! I need to purchase a new pump for my 4500 gallon koi pond. I have been looking online and have found a few options but I am curious as to what you use and why you do or do not like it. I would love some input on which brand you use. I have never used a submersible pump but it looks like something I may be interested in. Having never used one I'm just curious on your thoughts!