If the water pressure in your shower has dropped you most likely have a clogged shower head. The primary cause of a clogged shower head is mineral buildup. Over time the minerals in your water will leave deposits in your shower fixtures. This is extremely common and also extremely easy to fix.
How to fix a clogged shower head
Step 1: Remove the Shower Head
Step 2: Clean with a brush
If you inspect the shower nozzles closely you may see the mineral deposits that at blocking the water flow. If possible, disassemble the shower head and use a fine wire brush or a paper clip to clean mineral deposits from the various parts. You may also be able to flick out the individual deposits with a paper clip. Be careful not to damage the finish of the shower head.
Step 3: Soak in White Vinegar
After cleaning the shower head as described above, or if you are not able to, follow up with a soak in white vinegar. If you don’t plan on cooking with the vinegar, you might be able to save some money by white vinegar for cleaning.
Using a bucket or old food container, pour just enough vinegar so that you can totally submerge the clogged shower head. Soaking the individual parts or the fully assembled shower head in white vinegar overnight will dissolve any mineral deposits you can’t see and clear up any deposits on internal portions of the shower head.
Step 4: Reinstall the shower head
Before reinstalling the shower head, apply some new plumbers tape or silicon grease to the threads on the shower arm. Using the same adjustable pliers as in Step 1, tighten nut on the shower head. There is no need to over tighten or apply too much force.
Finally, test the water pressure. It should be flowing like new.