You can also walk into any hardware store and buy really caustic stuff with nary a safety label.
BS”D
Yes, and they export that stuff to Eastern Europe where we have no safety regulations to speak of except that you have to bribe the local standards institute. The first and last time I used sulfuric acid drain opener was in Moscow – it was BAGI POTCHAN made (and packaged shoddily) in EY.
If you MUST use caustics, do NOT face the keli you are pouring the chemical into. Figure out the longest safe distance between you and the farshtopped sink or whatever, open the bottle, and then face AWAY from the keli while pouring the stuff in backhanded (back to the keli is best; side is OK if you can’t pour from behind). This way if chas vesholom something does happen, your face and eyes are safe B”H and the worst you get is chemical burns on your back LA.
Has anyone used any of these safe biological drain cleaners?