Lower pH with these all natural pH adjusting crystals. Earth Juice Natural pH Down can be used to adjust fertilizer and foliar spray solution for a much more effective use and faster absorption of nutrients by plants. Optimal pH range for fertilizer/ nutrient solution for most plants is 5.5-6.5. Mix solution thoroughly and adjust pH prior to application. Use the solution that day. Will vastly improve all fertilizer solutions performance. Earth Juice Natural pH Down will “soften” hard water, increasing the effectiveness of insecticides and herbicides, too!