By Double J Liner Repair · Troubleshooting · Published 2026-10-23
A single slow sink usually means a local clog of hair or soap scum near that fixture. When the kitchen, bathrooms, and laundry all start draining slowly at the same time, the problem is almost always downstream, in the main line that every drain feeds into.
Here are the most common causes and what to do about them.
Roots entering through cracks or joints form a net inside the pipe that catches everything flowing past. This is one of the most common causes of whole-house slow drains in older San Antonio neighborhoods with mature trees.
Older cast iron pipes build up rough scale on their interior walls over time, narrowing the opening and catching debris.
Cooking grease cools and hardens inside pipes. So-called flushable wipes do not break down the way toilet paper does. Together they create stubborn blockages in the main line.
Shifting clay soil can push pipe joints out of alignment or create low spots where water sits. Both slow down flow and collect debris.
Snaking or hydro jetting the main line will usually restore flow in the short term. But if the underlying cause is structural, like roots coming through cracks or corroded pipe, the slowdown will come back.
A camera inspection after cleaning shows whether the pipe itself is damaged. If it is, UV-cured lining creates a smooth, jointless pipe that resists roots and buildup, so the problem stops recurring.
Call before it becomes a backup. Water coming up in a shower or tub when you run another fixture means the line is close to fully blocked. Double J Liner Repair can inspect your line and give you a free estimate. Call (210) 802-2018.
Chemical drain cleaners rarely reach main line blockages and can be harsh on older pipes. A main line problem needs professional cleaning and inspection.
Recurring slowdowns usually mean a structural problem like roots or corrosion that cleaning alone does not fix.
Lining creates a smooth interior that resists buildup. In corroded pipes, flow often improves noticeably.
Double J Liner Repair offers sewer camera inspections and free estimates on no-dig sewer repair in San Antonio, backed by a 10-year warranty. Learn more about sewer repair or read more sewer and pipe repair guides.
Double J Liner Repair · 1800 NE Interstate 410 Loop #216, San Antonio, TX 78217 · Phone: (210) 802-2018 · Email: Info@doublejlinerrepair.com
Hours: Monday–Friday 8:00 AM–6:00 PM, Saturday 9:00 AM–2:00 PM, Sunday closed.