Originally Posted by SankePankey
If you are using an aquarium pump, you have to use a 2. If you are using Ox, get the .5.
I have a similar thread going on the same subject. I think I'll be going with a 2micron stone for an oxygen setup. I really don't feel like messing with a clogged stone all the time and the 2micron stone comes with a SS wand already attached. I can't see a 2micron stone taking that much longer.