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01/10/2007: "NEW DESIGN WATER FILTER ....... high pressure compressors"

Removes 99.9% of water - built especially for the auto industry. 51 international patents. I asked some friends what they thought about having super-dry air for scuba tanks.

Comments by Robert L Sands, a recompression chamber expert.

Dry air was not considered as important as oil-free air. Perhaps the people in Taiwan who designed this water filter will appreciate the following:






About the dry air thing. Essentially, our lungs like moist air. Compressed SCUBA air (or mix) is always very dry and our trachea senses this on inhalation and we lose a lot of water vapour with each breath in because our body does its best to wet the gas with body fluids.

Same with oxygen in a chamber. The patient or diver gets out of the chamber (or water) and is essentially dehydrated.

We always send water in with the patients and give them instructions to "drink until they pee like a horse." In most hospital situations, the staff use a nebulizer to bubble water vapour into the breathing gas.

A wonderful thing about immersion is that the blood pooled in the legs by gravity and walking around changes when in the water.

That blood ends in the abdomen and the body’s "buffering" systems kick in, assuming a larger-than-supposed-to-be amount of fluid.

While in water, the plasma in our abdomen is reduced through kidneys and that is why the students always pee-d in their wet suit.

Me? I had a comfort zip. I always made the students wash their own wet suits.

A medical off-shoot of this is that we now take old patients and put them in a big plastic bag – up to their chins. They stand on a little platform in an inch of water and we hit a button and the platform sinks beneath them and they float in warm water for twenty minutes, the plastic bag they are in keeping the pool healthy.

Then we hit the button and stand them out of the water again. We do this three or four times and manage to mix their blood nicely and get their veins empty and full and empty and full.

Now about Val T’s comment (below) on a dry mouth. That was my route too, a swill of saltwater around my mouth.

Mind you, the last thing you want to do is breathe and saltwater vapor. Because the saltwater is more viscous (thicker) that the usual water within our lungs – the "surfactant," the osmotic pressure would shift and the little blood vessels would leak plasma into our alveoli in an attempt to thin the salt out. "Salt water aspiration" was common amongst the students, coughing and coughing.

And, when a person drowns in salt water and is revived, they can drown in their beds at the hospital later that night with the phenomena we called "secondary drowning" or "mushroom mouth." Osmosis at work. On the other side of the osmotic pump, a person that drowns in a fresh water lake will actually dump a lot of water ingested into their lungs right into the plasma and the pathologist will find freshwater flora and fauna in the blood.


So, the thought of inventing a just the right amount of appropriate vapour in a SCUBA is not on.

The idea of adequately responding to the dehydrated diver has merit.

Thinking about it, had we had the plastic squeeze bottle of fresh water back then, I would have happily carried one to the bottom of Wal’s Bommie for a glug. And a squeeze bottle with a one way valve would not take on air with each swig and would maintain the correct buoyancy and not rocket to the surface if you let it go.

There is a commercial idea for you . . . Something to keep SCUBA divers full of the right sort of sugars (energy) and the right sort of water during the dive.

People (investors) are always looking for a good idea and that one has some science behind it . from Bob Sands.








As far as I know, air should have a small amount of water in it otherwise you will get a dry throat. If that happens to me I simply drink a small amount of sea water.

It is much more important to have oil free air. Some oil vapor gets in the air from the lubricating system and as you know one can sometimes taste it. Not good.

P.S. Stay healthy and beware of beautiful young ladies, (in Taiwan). from Valerie T.