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Old 05-17-2013, 03:56 PM
Location: SoCal
347 posts, read 1,249,926 times
Reputation: 404


Hi All,

12-months ago I had a plumber retrofit a single-lever shower/tub faucet in our existing bathroom. The faucet replaced an old hot & cold faucet for the tub.

Anyhow, over the last six months the water pressure has been gradually decreasing. I'm at the point now where there is not enough pressure to take a shower.

The facts:

1. Single handle Delta Multi-Choice faucet
2. I replaced the cartridge, but that did not help to increase pressure.
3. The shower head is not clogged. The water pressure is low from the tub spout.
4. Pipes are 1956 galvanized piping.

I'm thinking the junk galvanized pipe has clogged/built-up something in the assembly behind the cartridge.
If I am correct, how can I clean this out? Or if I'm wrong, any other thoughts on how to fix this?

Thank you!!

Last edited by mandK; 05-17-2013 at 04:05 PM..
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Old 05-17-2013, 05:43 PM
4,761 posts, read 14,002,768 times
Reputation: 7950
Originally Posted by mandK View Post
...I'm thinking the junk galvanized pipe has clogged/built-up something in the assembly behind the cartridge...

And your old faucet allowed those particles to pass through.

New faucets are low flow and have tiny openings. They quickly clog with particles from old pipes.

What you can do is install new pipe from spin down filters (one for hot and one for cold) to the tub valve. A spin down water filter is a screen filter which can easily be cleaned by opening the bottom clean-out valve. Plus you do not need to buy expensive replacement filters.

This might be easy if your pipes are run in a basement and it is a first floor bathroom. You could install spin down filters there, then new pipe up to the tub.

Or might be easier to install an old fashioned faucet again if the pipes are impossible to change.

And when the pipes are open to replace them, you can connect a garden hose to the bath faucet and force water backwards through the faucet. That is called "back flushing". That should get the particles to come out the open pipes. Turn the faucet to both hot and cold to flush each.

Spin down filter...
(Or search google.com for spin down filter.)
Rusco Hot Water Spin Down Filter System - 1 1/2" - FreshWaterSystems.com
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