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The sponge helped the response time a bit, but not by as much as I expected. It took 10 - 15 minutes for the color to reach about 2/3 of the way to the final color. So, I tried one last design, using the Tyvek Priority Mail envelope material:




This one used the same size KH reference sample, the same amount of indicator reagent, a sponge, but a Tyvek membrane. It reacted exactly the same as the one above using the Cole Parmer transparent membrane. This one is easy to make, a piece of plastic, an O-ring, and a suction cup airline holder. It took me about an hour to make. It is easy to load, easy to read, easy to make, and responds almost 10 times faster than the glass drop checker. And, everyone should be able to get a Priority Mail envelope to use as a membrane. I think I have exhausted all of the ways to make a drop checker!
I like this design as I have all the supplies to do this one but I can't figure out where the reading is coming from... Is it just the sandwiched Tyvek membrane spaced from the O ring that is allowing the exchange in reading ? Or am I missing something as to where membrane is exposed to the water ?
 

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Thank you Hoppy I understand exactly what you are saying now. I might try something like this soon thanks for the great write up and trying different types!
 
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