Observation

[Samw]

Jack, bare bottom was actually the way things were run 10 years ago. Then Dr. Jaubert came up with the plenum system in the mid 90's, which evolved into DSB setups.

Hey Brad, 10 years ago IS the mid 90's. So bare bottom and DSB were equally used in the '90s I take it to mean??

Maybe this is the bandwagon to jump on? I better remove an inch or so of my sand then. I'm at about 2" and the sand is very dirty.