Improper plumbing design or installation can lead to significant drainage issues, even when there’s no visible clog in the line. If your pipes are not properly sloped, water may not flow efficiently, causing it to pool or drain very slowly. This is especially common in older homes or DIY plumbing setups where the layout doesn’t meet current code or best practices. Undersized pipes, sharp turns, or poor venting can also restrict flow and lead to ongoing drainage problems. Over time, these issues can worsen and may even cause premature pipe wear or water damage. A professional inspection can identify and correct design flaws to restore proper drainage and prevent future problems.