[pure-silver] Re: new darkroom

  • From: <mark@xxxxxxxxxxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Thu, 22 Dec 2011 09:28:06 -0700

I don't disagree that a risk is there, but I can count on one hand in the last 50 years the time I have lost water pressure.  In some areas it may not be common, but plumbing needs differ based on area and climate.  My pipes are only buried about 6 inches here.  In Pittsburgh they were over 2 feet down.  It's why plumbing codes are local.  In my subdivision which is fairly new, I think it was the water association that got EPA'ed, but it really isn't a bad idea.  If water pressure is lost that check valve closes and nothing can be get back in to the treated water system and pumped to the next house when pressure is restored.  If it is closed off and all other valves are closed in the house, there is no where for the water to go.  None of this even matters unless you have a hose that comes down from a faucet.  You can no siphon unless the end of a faucet is in something.  Even then just don't leave the end of the hose in a fluid and you don't have a problem.  Leave it in a full sink and you will.

-------- Original Message --------
Subject: [pure-silver] Re: new darkroom
From: Jean-David Beyer <jeandavid8@xxxxxxxxxxx>
Date: Thu, December 22, 2011 7:40 am
To: pure-silver@xxxxxxxxxxxxx

mark@xxxxxxxxxxxxxxxxxx wrote:
> Unless you left the darkroom set up all the time and the hose dangling
> in a filled sink that risk is extremely small. I pretty sure here
> almost every house has a back flow protection at the meter. If the city
> water lost pressure, the back flow stops anything past the meter from
> being pulled back into the city line, and would keep any thing from
> being pulled far enough in anything dangling for it to be a big deal.
>
The risk you pose is very real. In my town, I, for sure, DO NOT have any
backflow prevention.

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