Homebrew PCBs

Does anyone know if those flexible air bubble hoses used for fish tanks 
are any good for ferric or CuCl etch tanks ?

see,  http://store1.yimg.com/I/animalworldnetwork_1863_24150004

I know they have a lead metal insert that gives them ability to be 
shaped, and provides the weight. If this lead is not covered in plastic 
then it will not stand up to these etchants after a while. I've just 
ordered some to try, as I'm having bad luck with other "air stones" sold 
at aquarium stores.

I've tried garden "soaker" hose, but the consistency of air release is 
very poor across its length. Its not designed for fish tanks.

I've also tried a series of 1mm holes in PVC tube, but the air bubbles 
are too large causing very low back pressure. Again this gives very 
non-uniform bubbling across its length. I found the air volume needed to 
get good back pressure way too high (tested with water tank and a 
compressor).

So I've come to conclusion you need lots of evenly distributed small 
bubbles to get uniform agitation.