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If you really really want to use a bog, I'd fill it with pea gravel and not soil. I would also put the gravel up on a grate of some sort and leave a void below it with a clean-out drain so you can at least flush water through it for cleaning. Maybe even have the supply water flowing in to the bottom and up through the gravel, then flow out the top. What you are really looking at is a filter similar to a skippy filter. If you really wanted to get fancy, you could put an air ring in the space in the bottom and flush air through it to aid in cleaning. At least a bog like this is cleanable. And yes....I would put the plants in pots so their roots don't take over the whole bog. Sorry I can't advise you any better than this....I just really don't like the idea of a plant bog as part of filtration anymore. I have this "thing" about any sort of crud being allowed to build-up anywhere in my system.
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