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A quick question for Photo engineer: What type of tubing did you use for the spirals? Soft copper would be easy and malleable but I am not sure how copper will hold up with the developer.
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DO NOT USE COPPER, BRASS or GALVANIZED. Use only Stainless Steel, 308 or better.
Do not store in the tank after use.
PE
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My that was quick. Off to the tubing supplier I go. BTW, I was monitoring a tank with plenum on Ebay thinking I could get it for $75 or and a coupe people took it to $180 in the last 8 seconds. Sheesh, at that rate I really do need to make my own. Also, there has been some discussion about drilling acrylic tubing and using an extremely small drill bit. Do you recall the range of sizes used in the past?
Thanks
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Plastics are mostly acceptable, but can interact with the color developer solution by absorbing organics. The plastic turns black and the developer loses potency. It is also best to use a different sparger for each tank in the case of plastic spargers.
I don't remember the hole size nor the number of holes if I ever even knew those numbers. Sorry.
PE
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There is a discussion on the Large Format Photography forum from May 2004 that details what size of drill bits that are required for the holes in the plenum.
Gord
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