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I use water cooling on my ST10 all the time in the warmer months. It allows me to use -25deg all year round.
I have a plastic drum of about 30l that was originally a water drum for a drip irrigation system. It was reasonably cheap from mitre10.
In it is a submersible aquarium pump. A 200l/hr cheap pump is plenty. It is connected with ~10mm clear plastic tubing. I drape the tubing from the camera over the top of my guide scope to stop it dragging. The return water just goes back into the drum held with a bulldog clip.
The pump will only raise about 1m of pressure. To start it up I connect it up and turn it on. I have to lift the drum up to just about level with the camera and the water flows through the camera. Once it is flowing I can have the drum on the ground. The other option is to put the camera level with the pump until it is flowing.
I never spill any water and it very simple to use.
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