It didn't look much different than the other one. I gave both of them the wire brush treatment to get most of the crust off and was interrupted by SWMBO while I was doing the H2O2 soak and only got one of them finished. They were both wet from the scrubbing and I simply managed to grab the wrong one.
I'm not using membrane diffusers like most guys do. These are ring diffusers made from what looks like the soaker hose that's used for watering your garden.
The back pressure was more than the 30psi gauge could tolerate so I shut the pump down immediately.
No blood, no foul, lesson learned - H2O2 soak is mandatory between seasons for ring diffusers.
And yes, a pressure gauge on your airline is a very good idea. I've got a pop-off valve to install but I've been low on roundtoits and haven't gotten that done.
