eswillwalker on Nostr: If there’s not an antisiphon valve on each faucet, then the water in the hoses can ...

If there’s not an antisiphon valve on each faucet, then the water in the hoses can backflow back into the system from the faucet. Siphoning can cause backflow to move uphill, also. I’m not able to explain how, but it’s a big problem in laboratory buildings, where there are often tubes running from faucets to equipment. This is why lab buildings often have two separate water systems, one for the lab water and one for potable water. Schools that are too cheap to plumb two systems will use antisiphon valves on lab sinks. But, antisiphon valves are annoying because when they get grit in them they leak, so people often remove them to stop the leak.