The acidity is well packaged. With a little care and consideration of the safety precautions (gloves, goggles, good ventilation (!)), You can also safely deal with it. I've diluted down 6% solution and thus brought the pH of my Koi pond short of the critical region.
Even as a cleaning agent is HCl class. My egg cooker emits. I used it always put vinegar, but 6% HCl is much faster and does not stink.
