problem with glass diffuser

[hibiki]

I bought a glass diffuser a few months ago, and complete forgot about it for a while but i now tried to set it up with a DIY system and no gas seems to be diffusing.
I assumed there was not enough pressure, but i tested out the diffuser with an air pump and dunk the diffuser in a bucket of water, and still no gass is going out.
Is the stone bad or somethign? any way to fix this?

 

[maxwell1295]

I use glass diffusers with my DIY CO2. Sometimes it takes a while to build up enough pressure. Sometimes the diffuser just won't anything pass through it. Make sure your connections are tight and that youhave no leaks. If those things are fine, I would think that the diffuser is the problem. An airpump should provide more than enough pressure.

 

[Purrbox]

Actually depending on how much pressure the diffuser requires, an airpump may not be sufficient to test it. Most have a pressure release valve that gets tripped if the pressure goes beyond a certain level.

 

[hibiki]

mine looks exactly like this

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7761404915&category=66794

i don't see how too much pressure would make it stop