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I'm now looking more into these pressure filters, and I'm seeing there are models out there with UV, mechanical, and bio filtration for koi ponds my size and larger. I'm wondering if these all-in-one filters may be the way to go instead of using a separate mechanical, UV, and 55 gallon biofilter. They seem too good to be true, considering their smaller size. Do they actually work as well as a large biofilter?
I think one difference that should be pointed out is that commercially available pressure filters are designed so that they are effecient. When you compare them to DIY setups, DIY setups are usually very inefficient, but can make up for that by being built large to compensate, for little extra expense.
Plus, you should take ratings for filters to be an approximate number. A lot depends on the design of the pond itself and what kind of water circulation it has, not just what the total water volume is.