The oxygen rebreather
(A.R.O) has been constructed with a waterproof bag
that only cost a few Euro's,
a piece of hydraulic hose (canister with telescopic
function to vary the volume between 900 and 1700
grams of Sofnolime. Pressure on the sofnolime is added by the
use of a elastic band that
is mounted. The loop is constructed of
pvc fittings and a corrugated
a mouthpiece made of a 3-way valve
normally in use for swimming pools.
The valves are build in a separate pvc
valve housing that are mounted on the mouthpiece.
The O2 cylinder is a surplus of my
diving equipment, the rest is from a
The autonomy is about 4 hours (with
1700 g of soda lime), but I tried it only
for 2.30 hours !
make the ARO neutral I have to add 2.5 kg of weight.
The oxygen bottle is supplied with a lever to
manually add oxygen in the loop. The oxygen line is fitted with
a large quick connector. To prevent the counterlung to 'stick' I
add a couple of hair curlers in the counterlung.