Why not just use vinager? Safe with no mixing.
it doesnt last long enough only a day for me then its up again,
I found a product for 15.00 a gallon at home depot called sikadur concrete cleaner & etch. MSDS sheet says 25-35 weight per volume phosphoric acid. The lable actually says phosphoric acid and nitric acid and water. Anyone ever try this a few drops and it lowers my 20 gallon res from 7.5 too 5.8.
Hitman40
this is meant to be good as it is whats included in some or most ph down solutions from what ive read nitric acid is very good for very hard water areas and is sold by one of the big nutes company's for this reason
I hate to say it and no offense to the poster but this doesn't work. Think about 1 thing. You will be smoking this, would you smoke battery acid?
what do you think is in shop bought ph down ? cake?
shop bought ph down is a mix of acids and is very caustic "because its acid!" just like all the other acids that are mentioned here
hydo farmers have been making there own ph down for years from battery acid, nitric acid and phosphoric acid or a mix of these , all for food grade plants a mix of all three acids hit the plants requirements thought the grow cycle ,
battery acid is not sth that you need a chem suit for, im a mechanic and have been handling it for years it will rot you clothes like bleach and sting if splashed in your eyes but nothing that a eye wash wont fix, it may make your skin itch just wash off with cold water ! handle with sense is all you need to do,
great thread
just because this is my first post doesnt mean im a newbie to this, i just felt it needed saying,
there is a plus for all three acids, if you use the concrete cleaner look out for the strengths of phos acid it change's in cheaper ones from around 48% to 80% read the label stronger is better value i find, if your going to mix acids do so in the water not with each other directly it what ive always done with no problems and the shop ph down is just much the same ,they sometime have a buffer some times not
this is IMO and rep to thread maker good DIY POST