Hi, i have been trying to save a couple of dollars in my dichlor purchasings and i happen to find stores where dichlor ios sold at very competitive prices, even though sometimes i get a very good to excelent quality and sometimes i get very bad products. Price is not a good indicator since i have bought dichlor of far better quality at lower prices than others at higher ones. Of course this is not always true, in fact usually is the opposite but not always. So: is there any way one can test or see if it is adulterated far beyond the price gain? What usual adulterants do y have to train myself to watch out for?