If you can blow through the diffuser like an airstone, it's broken.I bought a diffuser off of ebay. One that I have seen in many images on this forum. But the thing is completely jammed. I can't even blow air through the ceramic disk. If I hold it upside down and blow water will come out.
I've tried boiling, bleach, and even just hooking up my system. But this little thing won't budge. Not looking to create a grenade in my apartment.
The water is probably from the boiling, and soaking after bleach