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Then I will turn off the mains connection to the butt from the tap

I want to create an automated irrigation system fed by the water butt. I need to ensure there is a minimum level of water to prevent the pump running dry and that may plants get watered even when there has not been rain.

OK. That is not the approach I was going to take. The valve would not be submerged at any time, that's what my design is looking to avoid. Did you see the image I attached?

Or are you saying the valve needs to be 150 mm above the rim of the container?

Thanks Tony. Yes I am aware of the regulations, I don't think the 150 mm will be a problem. Good call on the double non return valve. I wasn't considering using a float valve, but the valve I need for my solution may not exist.

Hi, Further to simpics thread (//www.diynot.com/forums/plumbing/water-butt-filling-question.361735/), I have been trying to come up with a cost effective way to have my water butt filled up by the mains as a backup to maintain a minimum water level. My proposed solution involves a...

Sorry for resurrecting this one from the dead, bad forum etiquette I know. Simpic I am curious if you ever implemented this idea, if so which approach did you take and was it worth the effort? I have been thinking along the same lines myself. The Keraflo option is on the pricey side.