Fatman, you calculated bleach at 7.5% - it is 5.7% chlorine. Anyway, I think we both ended up in the roughly same neighborhood. Wouldn't hurt to double check though.
If one wishes to use oxygen they could just buy a small disposable cylinder for welding from a hardware store. Electrolysis is accomplished by passing a small current through your solution. Just place two wires with bare ends about 1" apart and use a small transformer. The products are O2 and H+ which is an explosive mixture so make sure your wires don't touch when you move them or you will blow up.
I think a bleach solution is the best and safest method.
Chlorox now say 5 to 10% in their MSDS. I chose middle ground and fudged from there.
A few real calculations we both left out:
If chlorox is indeed say 5.75% They are really very non specific.
5.75% NaOCl, which is in solution as
(HOCl + OCl)
Atomic weights:
Na= 23
O = 16
Cl = 36
So HOCl = 75 and OCl = 52
52/75 = 0.69
0.69 * 5.75 = 3.96% (HOCl + OCl)
Convert to ppm : 3.96/100 = X/1000000
Therefore X= 39675 ppm
Waht we really want is to add enough chlorine to be adding enough to react with the dead organics (dead roots) and still have a residual clorine level of o.4 ppm. Drinking water usually had a residual of 1.0 ppm with 2.0 being the maximum residual aloowed by the EPA.
So typically with chemical nutrient water as a preventative we add enough to obtain a 1% level as if there were no organics to oxidize ( ikes no roots ).
Now the back of the napkin or table cloth calculations that do not require a calculator. Lets just roughly assume that the ppm is 40000. Lets also roughly assume a gallon contains 4000 ml instead of 3785. If we want a 1000 ppm solution we would need 1/40 of a gallon of the chlorox put in a one gallon bottle for a 1000 ppm solution. Meaning 100 ml put in a 1 gallon jug with water then added until full would give us a solution we could use at a 1000 to one ratio with nutrient water.
Saying the gallon is 4000 ml that would mean adding four ml per gallon. Considering all the roughness and such and the fudging of saying there is nothing being oxidized I would say
with 100 ml of chlorox added to a gallon jug of water then filled with RO water it is safe to then use 1 teapoon per gallon initially then 1/2 teaponn per gallon every other day after that.
Ba da, ba da boom goes the hydrogen and oxygen.
There are pellets made and sold to industry that strip nearly all gasses from air but O2. They are used heavily by waste water treament plants. All of the air pumped into their waste water reactor tanks drawn first through the pellets. They are reusable and have a life span of over 10 years.