[JohnK]

OK - so I got my twinset from Andy at Dalesdiver and he was great at explaining the set up and why etc. This is how it looks (viewed as if I`ve got them on)

Left post - SPG, Secondary reg to right, drysuit inflator to right

Right post - Primary reg, BC inflator to left.

One thing that I dont understand, if I isolate the LH cylinder or isolate at the manifold, how will I know what is left in the RH cylinder apart from adding another SPG.
I`m assuming that I cant reuse the LH cylinder due to SPG blow out

My answer would be abort and surface immediately (incl safety stops etc) Does anyone have any other views???