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Eric
I have one question for you. If you use the "itchimatsu pad system" what will you support it with? At this point, from your diagram, there is no support.
Also, what type of media are you using in the upflow section? Is that supposed to be K1 media? Also, what size is this filter going to be? How many cubic feet of media is included? The concept is not bad, down flow outer with upflow inner with aireated media. Depending on size you can then figure your flow rate for your system. I think I remember you saying it will be about 6000 gal!? If this is pump fed, what will be the water source. Directly from bottom drains or will it be pulled from a vortex settling chamber?
I know, I started out saying I had ONE question, then I asked several more. These are things to think about but you may just have struck on a new idea of an old theme. If it works it's great! Also, in your post you mentioned that this would be a "pressurized" filter. Not unless the whole thing is totally sealed with a container can it be pressurized.
Mike
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