I picked up a place that had been sitting for awhile. I flushed the water lines at the bottom of the tank on the well. It got rid of most of the rust in the system. So when I flushed out the water lines, one of the two bathroom sinks is having a flow issue on the cold water side.

Is there something that can be done if only one side of the facet is running with low flow?

In this case, if you turn out the facet for two minutes you get a quick shot of cold water and then a dribble. The valve under the sink is fully open on both Hot and cold water sides. Since this is only a cold water side, I don't know if you can rebuild the Delta facet or just replace it.

Ray,

Have you disconnected the supply line from the faucet to make sure you don't have blockage upstream from the faucet? If you don't have good flow from the supply line, the problem may be in your cut off valve.

If you are getting good pressure from the supply line, you may be able to just take the faucet apart, clean it, and put it back together. I like to run a little water through the faucet body without the cartridge in it, but this does create a bit of a mess.

If that doesn't work, you may need a new cartride on the cold side. I'm assuming from your description this is a two-handle faucet.

DIY.

Ray the horse has left the barn-- leave the door open.

When we have an open street pipe we open the un-regulated side of the faucet on the house. This is before it enters the actual system.

When we change or work on water heaters we take the strainers off all the faucets (kit, baths etc)-- sometimes the shower heads also and run it clear.

RayRay,

Sounds like a chunk of rust caught in the valve.

Pull the stem and turn on the water, that MIGHT blow it out.

Another trick is to back flush it with compressed air to dislodge any debris…but it might just come back.

Whenever we TOUCH galvanized pipes (just the slightest jiggle or change in pressure will loosen crud) we open the TUB faucet to flush the lines. No aerator to clean and easy to see when the water runs clean.

There are many ways to clean out old galvanized pipes, but you run the risk of puncturing them. For example: on large sized pipes, I can run warm water thru a pressure washer and flush the lies while I "Sand Blast", run a specialized cable while jetting breaking loose rust and deposits. I have over 40 years experience and $50,000 in equipment to flush lines instead of replacement.

Pull the faucet apart, run the water with no valve. Put a rag on it to catch all the high flow water. If the water is still coming out strong then tapers off to nothing you need to look at the valve.

Usually the valves are 3/8 and don't get stuff stuck in them. Doesn't mean they won't tho. Run the water for a bit to get all the crud out. Clean and/or replace the cartridge and you should be GTG.

If you decide to replace the entire faucet run water from the lines into the trap just to be sure you don't get more gunk in the new faucet.

You are probably already done with the project since you inquired about it yesterday.

PS

Shut off valves clog too.