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Received from Dave at 3/23/2019 11:41 PM UTC: I have no idea, but for sure a fairly tiny hole can pass a lot of air at a fairly low pressure, so unless the holes are really really tiny the hole

all scientific stuff is incredibly pricey! If I were back in a lab, I'd guess the tube I described could cost close to $300 from a lab supply house. And searching extensively... I can't find

Received from dale.chatham at 3/23/2019 10:08 PM UTC: This would be GREAT provided the pressure needed to make a decent amount of bubbles can be supplied by a simple vibratory fish tank air pump.

LOL indeed! That thing looks like a converted piece of labware. If purchased from a commercial labware company the unconverted equipment would run (semi-wild guess) maybe $600. A straight glass tube

Actually in "chemistry lab terminology"? they are called fretted glass filters.? Generally, they are 1-3" dia funnel sort of like devices with a fretted glass disk down near the bottom.? For

Ok, good to know. Thanks for the followup. I don't think it will fit in the etchant tank I am going to build though. But still good info. Thanks

I didn't call you a liar. What I did was suggest that you probably hadn't read the listing very well by saying, "I seriously doubt that Amazon sells 33% H2O2" and followed that with "I bet it's 33%

Exactly.

I'd wonder if the average water pump can handle corrosive solutions. I've not seen any except the peristaltic pumps, which you could make yourself, I suspect. FeCl I've used for a long while at the

Submersible pumpw have a sealed motor area.? The impeller is in a separate area, with a nagnet on the motor and another on the impeller.? They are salt water safe.? Over time, salt water is very

Dale, ? That first link looks like what we are looking for. The second link though I don't think we would want to put a submersible pump in the etchant though. I am sure it has some metal parts??

Dale, ? Thanks for the added info.

??? ??? That is what I heard so I want to avoid problems of any kind.

Hi Jim, ? Ok, I will see if the local shops know of them. I already found them under "gas dispersion tubes" too online but those scientific ones are pricey. Iam sure I will hunt one

https://smile.amazon.com/JARDLI-Diffuser-Counter-Aquarium-Planted/dp/B01N36MAO4/ref=sr_1_1_sspa?keywords=co2+sintered+glass&qid=1553378698&s=gateway&sr=8-1-spons&psc=1Consider something like

Also called scintered glass.? Look for CO2 infusors used in pkanted aquariums.IMO, smaller bubbles meam more aerosolization if the etchant.? As I've said, the aerosol us very corrosive.? You almost

On July 13, I ordeed 35% undiluted.? It seems to be unavaikable.? I call the labelling about as deceptive as it comes.??From an the description: "Offered at an extreme discount to introduce this

LOL, I never heard of a "fritted gass bubbler" so I googled and one of the first "hits" ,pun intended.was this: https://www.youtube.com/watch?v=DQOBdtsKqaQ

Also, no one called anyone a liar. Someone pointing out that another is wrong is not the same as calling them a liar. -- Steven Greenfield AE7HD

? Reading the listing, it has been diluted to 12%. Dave - WB6DHW