Homebrew PCBs

grantfair2001 wrote:
> After about 24 hours, the 12" airstone is mushy...

Damn, well there goes that idea out the window.
Was this the one you got ?
http://www.quickgrow.com/images_shop/aqua_fizz_12.gif

I spent some time looking for air stones and gas dispersion 
tubes. The closest thing I found was the porous hose used for 
irrigation. The stuff I got is 1/2" ID and made from recycled 
plastic and rubber, and appears to be acid very resistant. I want 
to know what people use industrially.

For the lab you can get fritted glass on the end of a tube. But 
these are expensive.

Try phoning hydroponics stores because they may have bigger range 
and variety. Ceramic air stones are commonly available, which I 
have never tried myself. Other people to try are in the water + 
sewage treatment industry. They may able to help. Just ask for 
fine bubble air diffuser.

Here is some stuff I found on the web.

http://southernaquaculturesupply.com/catalog2002/aeration/019.shtml
http://www.redvalve.com/Products/Air_Diffusers/Tubeflex.html
http://www.netpets.com/fish/reference/saltref/diffuser.html
http://www.vertexwaterfeatures.com/air6.html