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The original was posted on /r/tifu by /u/T410 on 2026-01-06 18:46:07+00:00.
My bathroom sink started clogging and the water was slowly filling up the sink. So, as anyone would do, I decided to use the drain cleaner. Not the gel one though. The granulated one. So as instructed, I pour down some and as instructed I poured some water on it and left it to do its job for 10 minutes. But not as instructed I forgot about it for almost 2 hours.
After I remembered, I casually went back to the bathroom to pour hot water down the drain as the final step. But lo and behold the sink was worse. The water level kept rising and rising without lowering at all. I then stopped the water as the sink couldn’t hold any more. I grabbed the bucket and put it under the sink. Then I unscrewed the pipe and due to the pressure the water + drain cleaner mixture splashed everywhere including myself. I got burned immediately. I left everything and jumped on the shower. Luckily I wear glasses and that protected my eyes.
I got small burn marks of the chemical on my left hand and right thigh.
After I jumped out of the shower I had spent 1 hour to properly clean the bathroom floor + walls to prevent my cat from walking on it. Then it was time to check the drain pipe. The U shaped metal pipe has completely clogged. The drain cleaner + water + 2 hours became cemented. I tried to melt it away putting it in the bucket filled with hot water several times. The best way was using my drill to carefully drill the cemented drain cleaner. That sped up the process.
TL;DR: I forgot about granulated drain cleaner for 2 hours and it became cemented. Then I got splashed hot water + drain cleaner combo and it burned me