Third one since spring. Drains fine for a week, then you’re at the sink at seven in the morning watching the water just sit there and not go anywhere. You’ve snaked the trap. You’ve poured the blue stuff down it twice. It keeps coming back, and that tells me it was never a clog to begin with the pipe’s closing up on you from the inside. Getting that out takes water, and a lot of pressure behind it. First thing everybody asks me is what psi is used for this process.
The Working Pressure on a House
Most residential plumbing work around Dallas runs 1,500 to 4,000 PSI. Covers a two-inch kitchen branch, a three-inch bathroom line, the four-inch lateral out to the alley. City crews run bigger rigs than mine. They’re also cleaning twelve-inch mains, so.
Pressure gets all the attention and it’s half the job. Flow gallons a minute is what actually hauls the mess out once the water knocks it loose. Watched a machine at 4,000 PSI and four gallons a minute scour a kitchen line beautiful and leave half the sludge sitting exactly where it started. Nothing behind it to move anything.
Somebody’s whole pitch is their pressure number and flow never comes up? You’re buying a spec sheet.
Why Two Houses on the Same Street Get Different Settings
Pipe material sets the ceiling. Anything built before the mid-seventies is probably still cast iron Lakewood, the M Streets, a lot of Oak Cliff. Eighty-year-old cast iron has scale on the walls and thin spots you’d never see from the cleanout. PVC shrugs off normal pressure. Clay tile still turns up in pre-war laterals and it forgives about nothing.
Then there’s our dirt. Blackland clay swells every wet spring, shrinks back every August, and takes the sewer line with it.
Camera’d two houses on one street in Casa Linda a while back. First line was straight and clean. Second had a joint pulled a half inch open. Same soil, same year, same builder.
Camera goes in before the jetter does. Every time.
What Happens at the Wrong Setting
Too much pressure on a bad line doesn’t blow a hole in good pipe. It finds the weak spot that was already sitting there hairline crack, a joint that’s separated and opens it wide. Now the water’s going into your yard instead of down the line.
Too little is its own mess. Fellow off Ferguson Road called me after another outfit did his kitchen line. Backed up again in three weeks. They’d run low pressure with a flushing nozzle and cut a channel right through the middle of the grease, left the rest of it stuck to the wall. Looked perfect on camera.
For about a foot.
And here’s the part I don’t enjoy saying. Pipe’s got real structural damage, there’s no PSI setting that’s the right answer. Cleaning it buys you a few months and a bill.
What the Water Takes Out, and What It Won’t
Grease is what this method was built for. Doesn’t plug a pipe so much as line it, layer over layer, till a three-inch pipe has maybe an inch of daylight left in it. High pressure strips it back to bare wall. Soap scum, food sludge, the scale our water leaves behind same deal.
Roots depend on the root. Hair-fine stuff coming through a joint, a cutter nozzle handles that in an afternoon. Pecan root thick as your thumb that’s already split the pipe is a repair, and the City of Dallas wants that permitted. Cleaning doesn’t need a permit. Replacing does.
Nothing fixes a belly, either. Line’s sagged into a low spot, waste pools there whether the walls are clean or not. I’ll tell you that before I unroll the hose.
When You Want the Best, Call Du-West
Waiting is the expensive part. Every backup pushes wastewater a little further into the house, and on a slab that’s flooring and cabinets ruined long before anybody touches the actual pipe. Du-West puts a camera in first, sets the PSI to the line in front of us, and says so plain when cleaning isn’t the fix. When you want the best, call Du-West.
Frequently Asked Questions
What PSI do y’all actually run?
Usually 1,500 to 4,000, set by what the pipe’s made of and how big it is. Flow matters just as much. Pressure knocks the buildup loose, gallons per minute carry it out to the main. Anybody quoting one number for every house isn’t looking at your pipe.
Is this safe on an old Dallas house?
Depends what the camera shows me. Cast iron from the fifties is all over East Dallas and scale hides thin walls behind it. Once I see condition, the pressure comes down to match. Some lines I’ll tell you not to jet at all.
Will it kill the roots for good?
Clears them. Doesn’t kill them. Cutter nozzle takes the growth out, but roots come back through whatever opening they found the first time. They’re getting in, there’s a defect in that pipe somebody needs to deal with.
How do I know I need this and not just a snake?
One backup in one fixture, a snake usually handles it. Same line going out over and over, or two fixtures acting up together, that’s buildup coating the whole run. Different problem, different tool on the truck.
How long’s it take?
Most houses, 45 minutes to two hours with the camera work. Tight access or a long lateral out to the street adds to it. We find something on camera, that conversation adds a little more.
Backed up twice already this year, the third one’s coming. Get eyes in that line before it picks a holiday weekend to do it.
