i have a 20oz. Gatorade bottle with a hole drilled undersize at the bottom SIDE. i use a single valve for airline (gang valve) superglued in place. i have a 3.0" square piece of plexi-glass SGed to the bottom of the bottle for stabiliy. set it on the corner of the tank and adjust to 4 drops per second.
i mainly use it for top-off (appx. 20 oz. daily) in my wifes 25GT. i add Ca, Mg, Alk, diluted in RO/DI to keep parms stable as possible. always rinse out the bottle before adding any supplements.
JDM
