After my first accurate water test I needed to lower the pH, so I got a gallon jug of muriatic acid. Pool Math said to add 18 oz. The directions on the jug say to partially submerge the jug and pour with the spout an inch or two above the water surface, I suppose to avoid splashing it in your face. But then it says to estimate the amount since it will be impossible to measure accurately.
Does anyone one have a better way to do this? Can you safely pour this stuff into a household measuring cup? Do some of you keep dedicated measuring cups for exactly this purpose? (My wife will not approve of me running into the kitchen to grab a measuring cup from the cabinet to measure my highly toxic acid, I'm sure!)
BTW, I did estimate the amount, rested the water about 12 hours later and found my pH had gone from 8.2 to 7.2 overnight, so I overshot my goal by a little bit.