If your sink trap is making bubbly noises, it likely indicates that there is a partial blockage in the drain or the trap itself, causing air to be trapped and released with the water flow. Fortunately, there are some relatively simple and least invasive steps you can take to address this issue:
Boiling Water: Start by pouring a kettle or pot of boiling water down the sink drain. This can help dissolve and flush away minor blockages, which might be causing the bubbling.
Plunging: Use a sink plunger to try and dislodge any clogs that may be causing the problem. Make sure to cover the overflow opening (if your sink has one) with a damp cloth to ensure good suction.
Baking Soda and Vinegar: If the bubbling persists, you can try the baking soda and vinegar method. First, pour half a cup of baking soda down the drain, followed by half a cup of white vinegar. Let it fizz and work its way through the pipes for about 15-20 minutes. Then flush with hot water.
Cleaning the Trap: If the above methods don't resolve the issue, you can try removing and cleaning the sink trap. Place a bucket or basin underneath the trap to catch any water that may spill. Loosen the slip nuts on both ends of the trap, and carefully remove it. Clean out any debris, sludge, or clogs, and then reattach the trap.
Pipe Snake or Wire Hanger: If the clog is deeper in the pipes and cannot be reached through the trap, you can try using a pipe snake or a straightened wire hanger to clear the blockage. Insert it carefully into the drain and maneuver it to dislodge any obstructions.
Natural Enzyme Cleaners: Consider using a natural enzyme-based drain cleaner to help break down organic matter causing the blockage.
Remember to be cautious when attempting any DIY fixes and avoid using chemical drain cleaners, as they can be harmful to both you and the plumbing system.
If the problem persists or seems beyond your ability to fix, it's best to seek assistance from a professional plumber who can handle the issue safely and effectively.