Water pressure spikes

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JHZR2

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My home is from the mid-1930s. It has all copper pipe.

When doing some work sometime back, we found a lot of dirt or sludge on the walls of the pipes inside. As I understand it, this is normal, and usually water pressure keeps it forced against the walls for the most part.

Still, because of that and the Cl in water, we installed a whole house filter. It does catch a lot. It builds a brown-colored coating on the surface and there is a lot of dirt/solids in the filter and housing.

We have had the filter on for about a year now. Over the last few months, we have noticed that when we turn water on at our faucets, sometimes it now really shoots out strongly for a second, then slows down to a more normal, steady rate. More recently, Ive noticed that on our single-handle mid-1970s kohler faucet (pull out to turn on type), when we get these pressure spikes, the faucet will actually start dripping water, I guess as it forces itself through. If I open the fauct, it will shoot out for a second, then revert to normal flowrate.

Why would this happen? It never has before. Do you think it has to do with our (maintained) whole house filter? Never seen this before with the filter installed. Do you think the pipes are slowly cleaning themselves somehow causing this? Only when the main water pressure is shut off and then restarted does the water have any coloration from this sludge. The rest of the time, there is nothing to see.

Thanks!
 
You may be having some pressure buildup due to the high dissolved oxygen content in cold water and the filter mounted in a warmer basement. There may be a small pocket of air developing as the water sits in the filter. If the water looks a milky white when you first open the faucet that is probably the issue. As for the sediment issue that is not unusual especially if your community is a well water supply. Feel free to PM if you need any more information.
 
As my water heater heats, it builds pressure against the suction side NRV, and can cause drips...
 
Pressurization from the water heater is the usual suspect. Does the house have a nonreturn (check) valve? Maybe the new filter mount has one? If so, you should get a surge tank to avoid pipe burst.
 
As my Brother in law told me when I worked for him water is incompressible, but air is not. Which I knew, but I learned a few other things while employed with him.

Air in the water lines sounds very plausible. Air acts like a spring. Plus when you do plumbing and get air in the lines it can act kind of explosive until all the water bleeds out of the line. Does any air ever seem to come out?
 
AAAH, WH install is suspect.. There is a blending valve down in the basement off the WH, and Ive noted that the cold side of that as well as the cold entry side of the WH piping does get warm... Plus Ive insulated it.

Makes perfect sense. Thanks!
 
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