Using battery acid to lower ph

Is sulphuric acid( automotive battery acid) an acceptable way to lower ph. For hydroponic.

No way. That shit is chock full of heavy metals like zinc.

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Ugh yeahhhhh not a good idea

Sulfuric acid is composed of oxygen, hydrogen and sulfur. It is fine but use with extreme caution. A little goes a long way. It is over half sulfur by weight. I used one cup per 50 gallons and lowered the pH by 0.1 The oxygen and hydrogen dissipate and the sulfur will remain.