Bog filter conversion

[Steiner]

Steiner, do you have any space above your fish pond to build an upflow bog? Then it can waterfall into your existing fish pond back down the stream to the natural pond where you can keep your current pump and have it pull from natural pond into your bog, to complete the cycle.

Sorry, but do not have that option. They are both inground and the secondary pond is 18 inches lower. Please hang on, I’m going to post pics and a diagram of what I’m proposing. Appreciate your interest.