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Hi,
The City has required our 36 unit Co-op on the UWS to install a back-flow preventer.
We attempted to install but suffered a drastic loss of water pressure throughout our building, and especially the upper floors, so we had to roll it back and remove it.
Our plumber told us that there may be many reasons why our water flow was impacted but he was certain that the water pressure coming in from the City pipes is low.
I am curious if any other buildings have had similar issues with installing back-flow preventers and if anyone has any advice.
Thank you,
Corey
Depending on your building, you may have the option of installing a back-flow preventer or a double check valve. The distinction is whether or not your building has any hazardous usage, such as a dry cleaner or dentist in occupancy. The double check valve might offer better water pressure. It should be simple enough to check your existing pressure with an inexpensive pressure gauge you could attach to a hose fitting in the basement. Your incoming water main has an effect on pressure too, and the water meter can also reduce pressure. We have a 2" main, the city installed a new electronic water meter with piping under 1.8", reducing pressure. Had to be swapped out for a full 2" version.
Either the backflow preventer or the double check valve also require annual inspections which need to be filed with the city.
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