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When sodium carbonate comes into contact with the ascetic acid in vinegar the result is a corrosive reaction. For this reason, the compound has been favored by many plumbers throughout the decades. The tub above was built long ago, and the drain system does not accommodate a mechanical snake very well.
The tub was draining albeit very slow. Before starting, I waited until the water was completely drained. The tub has no overflow, but I was able to insert a tube into the bend until it hit an obstacle. (Probably the P trap.)
In a separate cup, I mixed hot water with baking soda and gave it a good stir. I poured the soda water into the plunger/tube, allowing the alkaline water to remain potent at the base of the clog. The plunger was rinsed with water, (to neutralize), then the vinegar was poured straight after the soda. I repeated several times, always alternating.
When there was no more foaming activity, I knew the clog was dissolved.
Baking Soda and vinegar is a good formula as well as good maintenance for gunked up drains, provided the compound is active where needed.