Hi
thanks for your input. I am adding buoyancy along the carbon fibre tube to the injector to compensate for the weight and also the orange poison bag will have a little bit of air inside it to hold the bag and also the ROV somewhat stable. I will have to apply a little downward thrust at the same time I inject to offset the thrust of the injector motor. I chose that type of injector because of of the capacity to very accurately preset the dosage.
I tried various in-line pumps but found that the seals gave in at depth. Obviously lots of trial and error to get the unit to function inn the way that I hope it can.
John
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