Our nutrient line can be mixed and stored in a reservoir. To prevent spoilage, place a circulator in your reservoir and be sure to use the entire reservoir within 5 days. For best results when not using automated irrigation systems, add an airstone to the reservoir and brew the nutrients as you would a compost tea – this will help the microbes reproduce. The pH may change from day to day, so be sure check the pH before each feed and adjust as necessary using FOOP pH Up / FOOP pH Down, or any pH adjuster of your choosing.