Also to get circulation to lower depths does not require the disk to be down deep either, relaxing the PSI requirement. If you are not adverse to putting a disk into a pipe or cylinder, you can put the inlet for water down much deeper than the disk, and the outlet several feet above the disk placement so that the air bubbles rising can pull water up through the pipe. You may be able to set something right on the bottom, though I cannot imagine what would be practical at that depth.

This is often done with under-gravel filters in aquariums. The air just has to be placed somewhere in the tube to get water flowing, not all the way at the bottom.

ASCII Art:
Code:
~~~~~~~~~~~~~~~~~~~ Water surface
   O o o O o
    o o 0
     oOo
   |  O |
   | o  |
   |  O |
   | oo |
   |  0 |
   |  o |
   | __ |  < ---- Disk
   |    |
   |    |
   |    |
   |    |
   |    |
   |    |
  /      \   
 /        \   <- Some means of stabilizing, holes for water to come in.
/__________\  <- Bottom.


*sigh* Forum removes spaces, sorry. I give up.

Last edited by liquidsquid; 11/09/17 11:50 AM.