Homebrew PCBs

On Wed, 18 Jan 2006 02:22:48 +0100, Bob_xyz <bob_barr@...> wrote:

>
> Another question on your setup - It appears that the two tubes
>
> attached to the air pump provide a supply and a return for the air
>
> pumped into the etch tank. Is that the case? If so, is there any
>
> special type of pump required to stand up to the etchant fumes in
>
> the return air?
>
>
>
> Regards, Bob


Most membrane pumps are all plastic.

The bad thing is the moisture will stick the valve washers, so i no longer  
use closed cycle.

ST