[BladeRunner]

Originally Posted by Maximilium

Here is some of the best answers for your questions, is an article writen by RoboTech in a similar thread i had a couple of month ago.

Controlling Pumps and Initiating Emergency Shutdowns

Good article, I will do a hardware shutdown sometime as a last resort emergency, maybe CPU or waterblock temp controlled to interrupt the green wire. I prefer the initial software based system to force hibernation as it saves the PC's current state / work in progress. I also like to test it often so keeping pulling the plug on the PC when it's running is not good practise.

I also have a solid state optical water level switch, (rs code 183-543), that I haven't had time to set-up yet, again if it works as described should more reliable than any float mechanism.