Thanks for the input. I thought the idea of the bog was to clean the gunk from the pond? I dont know how much resitance a bog adds to the water flow. Could I use an air pump to pump up from the suction grid to a open top filter sitting just above the top of the pond. Then the water would filter down and into the pipes of the bog or would the bog pipes be to much resistance and the water would just overflow the top of the filter? For a filter I was just thinking a few layers of filter pads. I have this now in my stream and it flows very well but its not going down into a pressure grid under a bog.
No bog isn’t a mechanical filter it needs something before it. Fines are no big deal and yes will settle out in the bog clearing the pond and the plants in the bog will prevent green water as well as reduce nitrates.
The open top filter may work initially, but eventually I imagine that is going to be the path of least resistance for the water going into the bog and will over flow the top of the filter. No longer forcing water down into and up through the bog. This will be due to roots as plants grow clogging the gravel and some fines building up on the gravel with the roots as well. Also where is the water going to go feeding the open top filter when the filter pads clog reducing the flow into the bog, usually where it goes is over the sides of the open top filter if I am understanding what you are trying to do.
Anyhow, my point of responding is to let you know that pulling water from the pond bottom where everything tends to settle and sending it to the bog while it can be done really should it be done. As it is Going to cause premature clogging of the bog.
You want to send nutrient rich water to the pond
