Simply Koi and More Koi

Hi Dick, Welcome to this brilliant forum, hope you get lots from it. I think you are getting a bit hung up with your interpretation of the cartridge size. In the 20 - 25 years since the 12inch cartridge was first recommended, an incredible amount of changes have happened. Originally the chambers we...

Not quite sure how much room you have at the bottom of the chamber but I would think you would need at least 4"- 5" underneath the cartridge and at least 1"of water above it ( matting 1" below the level of the weir) Then however much room is in between is the how high you make t...

The main point is the matting must not be a solid block but instead have spaces in a checker board like pattern that allows a good exchange of water and nutrient to the bacteria living within the matting. I feel a vertical setup with the water flowing from below to above with air from beneath and a...

OK, no real rush for the 'experts' to answer the above.

Oh and then there's air with matting. Air below matting or air above? Or no air at all as matting doesn't need it?

So what if the multibay chambers are 3ft deep? Are people now saying you raise the grid to allow for the supposedly correct 12" matting cartridge to just sit above the water line? Or are we to assume the return outlet is low enough to only allow the correct amount of water in the chambers for t...