There are no hydo shops or even garden shops anywhere near here. I went to the website for that aquarium Ph down ,the stuff I was using. After a lot of searching (I think they 're trying to protrect a trade secret by making the info hard to find?) I found out Ph down is actually sulfuric acid and a hazardous substance. That can't be good. I'm gonna flush my babies a lot with RO and never use that shit again. I have had no luck with this. I'm seriously thinking about just trashing the whole op and starting over. Sulfuric acid? Christ, that shit is fucking lethal! Now it's in my grow.Fuck! Salts my ass. I wish it was just that.