[MysticKoi]

Quote: If you need to replace the diffuser on the Rhino, I understand the cost is around $140 as THEY ARE THE DOME. Oh, and you'll have to figure out how to cut the air line to it as well, which comes in from the side. A poor design in my opinion as the tubing can catch algae and leaf debris and reduce the performance of the drain line. The Koi Toilet gets it's air supply directly through the standpipe which comes up through the bottom of the unit.

Mike... I think you are confusing the Sugarloaf air drain with the Rhino drain. The air diffuser on the Rhino screws off from the dome, which also can be screwed off (two separate components, just like the Toilet). Further, the air to the Rhino is supplied through the central support shaft (again, just like the Toilet).

Things I like about the Rhino;
(1) Much stronger and robust than the Toilet - schedule 80 (not sure what you mean when you say the Toilet is code approved)
(2) Rebar tie down
(3) Seperate air line
(4) Seperate air diffuser
(5) Full unionized air check valve

Things I like about the Koi Toilet
(1) Cheaper (ABS?)
(2) Separate air line
(3) Seperate air diffuser
(4) Bowled bottom

Kind Regards,
Bill