It depends on the type you are using. If you are using the glass with ceramic disc type, they can work at lower pressures (say 20 PSI). If you are using an atomic diffuser, they may require pressures of 40 PSI or more.
Where can I get the atomic diff. from eBay? Does any of that matter on the size tank u have too?
Last edited by newbieplanter; 02-12-2013 at 12:16 AM.
Reason: More to add