Why Your Drain Keeps Clogging

By the Plumbing Pros Sherman TX team Published February 25, 2026 · Updated August 15, 2026

One clog versus a pattern

The most useful question with a clog is whether it is isolated or part of a pattern. One slow bathroom sink is almost always a local blockage, hair and soap in the trap, and it clears easily. The situation that deserves attention is the repeat: a kitchen line that backs up every few weeks, or a clog that returns in the same spot no matter how many times it is cleared. That repetition is the pipe telling you the blockage is not the whole story.

Even more telling is when several drains slow down at once, or when using one fixture causes another to gurgle or back up, for example running the washing machine and watching a floor drain rise. That pattern usually means the problem is not in any single fixture line but in the main line they all share, which is a different and more serious diagnosis than a clogged trap.

What is actually in the pipe

In the kitchen, grease is the usual villain. Poured down the drain as a liquid, it cools and hardens on the pipe wall, gradually narrowing the line until it closes. A cable clears a channel through it, which is why the drain works again for a few weeks, but the coating is still there and closes back up. The honest fix for a grease-coated line is to scour the wall clean, which is what hydro jetting does and a cable cannot.

In the main line, the culprits are different: roots that have found their way into an older sewer lateral through a joint, or a section of pipe that clay movement has pulled out of line. Sherman and neighboring Denison have plenty of older housing with clay-tile or early cast-iron laterals sitting in expansive Blackland clay, and that combination is exactly what produces recurring main-line clogs. When a clog keeps coming back in the same place, a camera inspection is how you find out whether it is roots, grease, or a broken pipe.

Why chemical drain cleaners are the wrong tool

The bottle of drain cleaner under the sink is tempting for a recurring clog, but it is usually the wrong answer and sometimes a harmful one. These products work by generating heat and a caustic reaction to eat through a blockage, and on an older or already-compromised pipe that heat and corrosiveness can damage the pipe itself. They also rarely solve a real recurring clog, because they do not remove the grease coating or the root mass causing it, they just clear a temporary opening at best.

Worse, if the chemical sits in a fully blocked line and does not clear it, the next person to open that pipe, often the plumber, is dealing with a caustic mess. For a recurring clog, a proper drain cleaning that mechanically removes the blockage, or jetting that cleans the wall, is both safer and actually effective. The chemical route tends to postpone the problem while adding risk.

The habits that prevent the next one

Prevention is mostly about what goes into the drain. In the kitchen, keeping grease out of the drain entirely is the single biggest thing, because grease is behind most kitchen recurring clogs. Let it cool and throw it away rather than pouring it down the sink, and scrape plates before rinsing. A sink strainer catches food scraps before they become a problem, and running plenty of water when you use the disposal helps carry waste through rather than letting it settle.

In bathrooms, a simple hair catch over the drain prevents the most common cause of slow tubs and showers. And for a home that has already had recurring main-line trouble, scheduled maintenance, clearing the line before it backs up rather than after, is far less disruptive than an emergency. If your clogs trace to roots or a damaged line, though, no habit fixes that, and the real answer is a sewer line repair that addresses the pipe itself.

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