Slow drains in sinks or bathtubs can point to a variety of plumbing issues. If only one drain in your home is slow, it is likely that the drain has a clog that is preventing the clear flow of water. Clogged kitchen sinks may be caused either by grease or by particles of food that weren’t ground up by a garbage disposal. Avoid using drain-cleaning liquids in your sinks and bathtub as they can be highly corrosive and may damage your pipes.
If you’ve noticed slow drains throughout your entire house, your plumbing system may be suffering from a blocked vent. These vents are designed to equalize the pressure in your pipes, so the disruption of airflow can also cause changes in drain speed. A plumber can help you find the block or clear clogs so that your sinks and bathtubs drain efficiently.