This might have an obvious answer, but I don't know it. When adding smaller amounts of bleach to the pool, do you guys measure it first or just eyeball it? For instance the bleach comes in 121 oz jugs and I need to add 2 Qts, 6 oz. Is there a recommended measuring pitcher to buy? I've seen some around, but they are food grade and kind of pricey. I'm still new to the method and I'm trying to be as precise as possible until I get a good handle of things. Thanks in advance.