I just originally built the pond with the plan of no fish.
I now have fishues
A lot of fishues. So I want to rebuild it the right way 1 time and then just plan on maintaining. I figured that eventually a bog will have to be flushed out so building it in a container that comes with a drain would make long term maintenance easier but whatever I need to do for my fish load is what I'd (cost being a factor) like to do.
As far as flushing, I estimate that my skippies really only need to be flushed once a year ( I went 2 or more years, I cant remember, without touching them at first, until I think the third year it started affecting the water flow). I only flush them as often as I do because its an easy way to do a quick water change.