Despite the prevalence of "chemophobia" these days (the irrational fear of anything "chemical based" (well EVERYTHING, all matter on Earth, is made up of CHEMICALS- even water is a chemical!), this is not one of those "evil", nasty chemicals that are "out there to get you"!.
It can be safely handled with a pair of rubber or vinyl gloves. Just use Common Sense, respect the chemical and follow the simple, easy-to-follow instructions! It is an acid and is corrosive, and like all acids, it has the potential to irritate or burn your skin if you lack Common Sense and are unable to use it in a competent manner (all acids, even household vinegar, is corrosive), but if you get it on your skin, it will not "immediately burn through all of your flesh within microseconds"- this is a fallacy and an over-dramatisation promoted by people who have next to no understanding of chemistry or the nature of chemicals.
If you accidentally get it on your skin, make sure that you wash it off IMMEDIATELY (don't delay) with plenty of cold running tap water for about 5 minutes and no damage will be done. Just use COMMON SENSE, and this chemical, like any other, can be used in a very safe, problem-free manner.
Acids react with metals, so do not store it in a metal container or allow it to come into contact with metals. In fact, all chemicals MUST be stored in their original containers. Chemicals can be used very safely and effectively if they are respected, if instructions are followed , and you use common sense. If you lack common sense and are unable to follow simple instructions, you should not handle any chemical.
This chemical has worked wonders for me- I live in a very hard water area, which means that the pH of the water is quite high (alkaline), which can precipitate certain essential phytonutients, such as magnesium, boron, calcium, and copper, from solution, rendering them inaccessible to your plants (the nutrients are no longer in soluble form and become non-bioavailable). This pH-lowering chemical effectively combats this problem by lowering the pH of your tapwater, enabling these essential trace metals to remain in solution. As well as being an effective pH-lowering chemical for hardwater areas, this is an excellent source of nitrogen (in the form of nitrate) for your plants- my capsicums look like they've been fed on steroids! Lush, green growth and HUGE fruits- a bumper crop of peppers!
PS: ensure that you use a DIGITAL pH meter so that you can accurately measure the pH of your nutrient media and are able to adjust the pH accordingly. Bear in mind that certain species of plants prefer a specific pH for optimum growth- some like slightly alkaline conditions; others like slightly acid conditions.