Low Water Pressure on Daniel Island? Check the Whole-House Filter Before You Blame the Pipes
When the water pressure starts slipping in a Daniel Island or Mount Pleasant home, it's easy to assume the pipes are going bad. The shower feels weak, the kitchen sink trickles when the dishwasher is running, and the pressure seems to fade a little more every month. Often the pipes are fine. The problem is a filter that's doing its job a little too well.
I'm Christian with Avery & Sons Plumbing + Tankless. Here's how to tell whether your whole-house filter is the bottleneck, and what to check if it isn't.
Why a filter can choke your pressure
A whole-house sediment or carbon filter sits on the main line, so every drop your house uses has to pass through that one cartridge. As it catches sand, rust, and grit, the openings fill up and water has a harder time getting through. It doesn't happen overnight, which is why most folks don't notice until the shower is noticeably weaker than it used to be.
Three things make it worse:
An overdue cartridge. The calendar date on the box is a guess. A cartridge can load up well before that if your water carries more sediment, or after work on the water main stirs things up.
A cartridge that's too fine. A very low micron rating catches more, but it also clogs faster. For a whole-house sediment filter, finer isn't automatically better.
A housing that's too small for the house. A slim 10-inch housing that works fine under a sink can't keep up with a whole family running showers, a washer, and irrigation at once. Whole-house systems need housings and cartridges sized for the flow.
A quick test you can do yourself
If your system has gauges on either side of the filter, compare them. A big gap between the inlet and outlet readings means the cartridge is restricting flow.
If your system has a bypass valve, put it in bypass and run a shower. If the pressure comes right back, you've found the culprit. Just remember to take it back out of bypass after you change the cartridge, so your water is actually getting filtered.
When you swap the cartridge, shut off the water first and press the pressure-release button if your housing has one. Check the O-ring, and replace it if it's cracked or flattened. A pinched or dried-out O-ring is a common reason a housing starts dripping after a filter change.
If the filter isn't the problem
Changed the cartridge and the pressure is still weak? Narrow it down by where the problem shows up:
Only one faucet or shower. That points to the fixture itself. Hard water scale in aerators and showerheads is a common cause here, and we covered it in our post on clogged showerheads and faucet aerators.
Hot water only. If cold is strong and hot is weak, look at the water heater. Tankless units have an inlet filter screen that can clog with debris, and scale inside the heat exchanger restricts flow too. Both are part of a normal maintenance visit.
Everything, even with the filter bypassed. Then the filter isn't the bottleneck. A water softener with fouled resin or a sticking valve can restrict flow, and so can a failing pressure-reducing valve on the main line. Those are worth having a plumber check.
What not to do
Don't pull the cartridge out and run the housing empty as a fix. It brings the pressure back, but it sends everything the filter was catching straight into your softener, your water heater, and your fixtures. And don't crank up the pressure-reducing valve to make up for a clogged filter; that just puts more strain on your pipes and appliances.
Easy next step
If your pressure has been slipping and you'd like someone to look at the whole picture, from the filter and softener to the water heater, Avery & Sons Plumbing + Tankless works on homes across Daniel Island, Mount Pleasant, and the Charleston area. Call (843) 305-5555 or visit averysplumbing.com.
A lot of the time, weak water pressure is a part that needs changing, not a pipe that needs replacing. It's worth ruling out the easy stuff first.
Comments