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GSP Wrote :arrow:

Hope you read this before you order.

I think those Coors prices are full retail. I've found that you can get them cheaper through a distributor.

The P-1/2-BC is actually the pore size. I just found the 2"X4" one (#60495), in the right pore size, on sale for $7.14. And you can buy them individually.

http://www.macbicnj.com/Mercha.....Coors60495

Here's a bunch of Coors stuff on sale. I notice there are some Buchner vacuum funnels on the list at good prices.

http://www.macbicnj.com/Mercha.....Code=coors

That whole Macbic site is nothing but clearance items. Great prices. Here's Coors spot plates for less than half price. The one pictured is not the one being sold. The one on sale has 12 depressions. Spot plates are the very best way to do stannous chloride tests.

http://www.macbicnj.com/Mercha.....34276-0160


Unglazed clay flower pot might work if you can plug the hole. We once discussed it on the forum. A porous cup (Coors) would work.
They come in different pore sizes.

I think the patent said that the pore size has to be .5 microns, or less.

Dupont makes a positive (will only pass positive ions) membrane, of teflon, called Nafion, in sheet form. There are lots of commercial membranes that pass only +ions, only -ions, or only +1 ions. A + and - pair is commonly used for desalinization. It takes the Na+ out through one membrane and the Cl- out the other. One can dream up tons of applications for these various electrodialysis or ion exchange membranes ganged together in various ways. I used to fill notebooks with diagrams.



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