How to properly bleed the main line

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Correct way to turn the water back on?
I was always told, shut it off with multiple open facets running.
When turning back on, leave only one faucet open, and slowly turn the main back on.
Question: Does it matter leaving multiple lines open when the water turns back on or is there a legit reason you only leave one open?

We did have an incident where the main water was turned back on via a gate valve, so not as fast as a ball valve (if that matters). But the brand new high tech dishwasher set off an error code and stopped working as it had sensed too much force running up into it to quickly. So I am more aware and delicate with doing this correctly.
What seems to be the best way to turn it back on avoid issues?
:)
 

Fitter30

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Fill system slowly not to hammer the piping with tub faucets on so as to flush anything in the line out then go around opening allother faucets.
 

Jadnashua

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Any time you turn off and drain the main line, you'll dislodge some crud when you turn it back on. But, if you're only turning it off to do a little service and not draining the line much, it really doesn't matter much. Just turn the faucet you worked on slowly. If everything is closed when you are ready to turn it back on, it will just compress the air. WHen you open a faucet, still do it slowly, and it's better to avoid opening any of them that have inlet screens or aerators last so you will flush out most of the crud elsewhere first. Sometimes, you just have to clean the screens afterwards, regardless of how you do it. The water won't flow everywhere into a branch when you turn it back on, so slow is better to limit the velocity of the flow which should minimize dislodging more. It shouldn't literally hurt anything, it just dislodges more crud. Some screens are a pain to clean, though.
 
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