Yup I use their combo of 5-12-26 Hydroponic, and 15-0-0 Calcium Nitrate, and because I grow autoflowers I never go past half the recommended mix. In flower I add Koolbloom liquid, and Koolbloom dry also at half the recommended strength. My plan is to move the plants forward through my three trays as they mature. Each tray with it's own nutrient goals. Tray one starts from seed, and I slowly bring up the JR Peters mix to full (half) strength. When I move the plants to tray two I introduce the Koolbloom liquid. Tray three is the finishing tray where I add Koolbloom dry, and then flush before harvest. As I harvest I move the plants forward, and start new seeds in tray one. My goal is to harvest a tray of plants every three to four weeks, but I know I'll have to be a bit flexible when allowing the plants to finish properly. So yes I do use JR Peters from start to finish, but add the Koolbloom in flower. I also add epsom salt to complete
the JR Peters formula for Cannabis.