FiNN HydroGel B is a polymer that is able to store water and nutrients up to 500% its own size and weight. Once Hydrogel B releases its store moisture and nutrients to the root system, it will replenish itself with the next rainfall or irrigation. FiNN HydroGel B is a plant watering aid used to reduce or eliminate stress caused by a lack of moisture. Packaged in 5 lbs. bags, 8 per case. Rates will vary depending on amounts and types of fertilizer . typically 10 LB per acre. See spec sheets for additional information.