Begin with the suggested use from the feed chart on the label. Gradually increase to higher amounts until you get a slight tip burn when you reach the plant’s threshold. If you happen to burn anything (which is highly unlikely), flush and back down on the ppm's, and your plant should be just fine. Our nutes are very forgiving, and you should be able to pump up the volume quite a bit with no issues. For example, one of our reps is currently growing in a greenhouse and running at 1900 ppms at the end of the bloom cycle. Keep in mind that all strains have different thresholds.
Additionally, dissolve your nutes in separate containers before adding them to the reservoir to avoid any lockout. Use a 500-scale ppm meter to measure the nutrient concentration. Because our products are pH-balanced, you shouldn't need to use pH up or down, however, if your water is way out of balance add pH up or down after you mix up the nutes to bring it to the desired pH level.