I have attached photo's of our twin five tray bakki shower-see "SA koi Pond thread". The bottom tray is empty and the four trays above contain a total of 100kg of Old & new bakki media per 4-tray stack. Holes have been drilled along the bottom of each tray holding bakki media. Unlike other Bakki Showers the only air collected comes from the top tray. Other Bakki Showers allow air access between trays. Here is my question-should the trays be separated to allow air movement to each tray from the sides or will this arrangement work drawing air only from the top tray?
see photo's attached.