You'll need quart bottles of pH Up and pH Down. If you're growing in coco or soil, you may need to flush with pHed water to clear out excess nutes. Measure and mix your nutes first then add them to your water. Mix well then test pH and adjust up or down as needed. Try making the largest batch you think you can use in a week or so and it will be more stable and it will save you the time of making it every time they need a drink. Be sure to only use half the nutes the maker recommends starting out because the feeding chart is the maximum you should ever use and that is for large plants. If you're in hydro, do a complete reservoir change then add nutes at half strength then adjust pH. Hope they make a comeback!