How to create a safe DIY Snuba Apparatus

My Idea so far is to use an air pump (maybe one similar to the one that pumps up inflatables?) is to feed air down a tube to a modified snorkle mask with a 1-way valve going in, and a one-way valve feeding just into plain water.  The air pump would have filters and a catalytic carbon-monoxide filter/converter (w/ small heating element) in the tube leading down to the mask.

The idea is that there is always a fresh supply of air running through the mask that there could be no deadly build-up of bad gases within the small area.  Included is a picture of how I envison it (minus the lame Microsoft Paint drawing skills).

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lemonie6 years ago

Carbon dioxide - what were you thinking of there anyway?

Zalo (author)  lemonie6 years ago
I'd read somewhere else that air pumps produced carbon monoxide even at low working temps, so I wanted to filter that. I didn't know about the nitrogen though... (our air has a bunch of it). Also Goodhart, I've seen those, and I think that both of them are extremely bad ideas (Especially the first one which is like a diving bell death trap.) The second one is a scuba tank Holder? Sorry about the picture not attaching, but you should get the general idea.
lemonie Zalo6 years ago

You want a non-oiled pump, like you get for aquaria. Or an oiled-one with proper filters. Either way it'll cost a lot of money (and you don't want someone up top with a manual air-pump)

Goodhart Zalo6 years ago
Filtering CO might be difficult at best...if the pump runs off a gasoline or diesel engine, it would definitely produce CO.
caitlinsdad6 years ago
1. the picture didn't attach. 2. You might want to be certified in SCUBA before you try to build something on your own. So depending on the depth you want to use this apparatus at, you better know the oxygen requirements/flow rates and gas balancing even if you just plan to go under in the bathtub. Too much air is just as bad as not enough air.
Pressure would be important, under pressure nitrogen becomes toxic and gets divers drunk. Hence using special mixes of air for high depth dives, it has something to do with our lungs
When you say "too much air"; are you referring to too much O2 ? or too much air pressure?

Too much O2 alone isn't bad, but I suppose under the pressures of being underwater it could become a problem (the astronauts subsisted in pure O2).
Goodhart6 years ago
There are some ibles on the subject already too:

Ible #1

ible #2