Similar to my irrigation system that stores well water in tanks for the pump. The level is watched by float switches connected to an Arduino NANO. One switch turns on then the water reaches the low level and that tells the NANO to turn on the SSR to the valve letting more well water into the tanks. The second float switch tells the NANO the tanks are full and stop the SSR.
Has worked flawlessly for about 5 years! Not used during the Winter!
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