Im in the process of building my first Koi/Garden pond. Its gonna be about 1500 gallons. I like the pressurized filters for there ease of maintenance and was planning on getting the aqua ultima 2 filtration system but I didnt like the fact you have to run an external pump due to the noise factor and i figured i also had to add a skimmer which means i need to run a second pump. While researching i saw a lot of other low pressure pressurized filters for half the price of the ultima that can use a submersible pump and wanted your guys opinion on which one you recommend. My plan is to go from the pond to the skimmer than from the submersible pump in the skimmer to the pressurized filter than from the filter to my waterfall and back to the pond. Please let me know what filters you guys use/recommend and if this setup will be sufficient for a koi/garden pond. I was planning to spend around $1000 for the filtration setup(not including fittings, pipe etc.) Thank you for your help in advanced.