Quote:
Originally Posted by schaadrak  Just a thought, but if the membrane idea pans out, these could be made even easier by gluing a piece of membrane to the top of any small clear container filled with indicator solution.
Like this: 
It wouldn't matter which way was up since water can't go through the membrane and you could use any small clear container you have lying around with virtually no modifications. Heck, you could just glue membrane to either side of a piece of air line tubing. Then if it starts going bad, toss it out and throw a new one in. |
As I recall, the membranes are made of teflon or polypropylene plastic, and neither of those is at all easy to glue. Both are, I think, considered "release agents". If you can use glue, I hope someone with the knowledge will tell us which glue to use. If I had some membrane, other than Tyvek, which is very thick and stiff for something like this, I would just wrap it around a piece of tubing and rubber band it in place. I do have a pretty nice piece of transparent vinyl 1/2 inch tubing I could easily use this way. But, the first steps are to find a source of membrane, and to find out if there is a glue that will work with it.
EDIT: I did some googling and found the obvious source of membrane material - Kordon breather bags! Who has some and is willing to supply one or two to me - of course I will pay shipping and cost of the bag(s)?
EDIT AGAIN: It only took a few minutes to get two offers of these bags, and both are relatively local to me! If I can make this work out I will make two or three extras and offer them to whomever wants them. But, I hope someone else tries this idea too.