To Order Polymer water crystals are sold at ptmbooks.com Search under “Polymer” in Title section. If you want a size other than shown, let us know!                                                                         WATER CRYSTALS A superabsorbent polymer invented almost 15 years ago to improve agriculture in arid conditions, Water Crystals have become a favorite of farmers, gardeners, and florists around the globe. Used extensively by the US Forestry Service and recently featured on HGTV, Water Crystals are making their way into homes and gardens across America! Water Crystals hold up to 400 times their density in water, and slowly release the water to the root of the plant, sometimes eliminating or saving up to 50% on irrigation costs and eliminating routine watering. They also absorb and slowly release fertilizer to the roots improving nutrient retention. Studies have shown that the number one cause of death to plants during the first year is due to stress from  lack of water. Water Crystals eliminate this problem by storing and releasing water as needed,  thereby preventing overwatering and supplying the necessary amount during stress periods. Prior to polymers, peat moss was the soil additive of choice to hold water (20 times its' weight), but Water Crystals (400 times its' weight) is rapidly gaining in popularity due to its' superior performance. Peat moss is seen by some as a non-environmental soil additive due to the manner in which it is harvested. However, Water Crystals are a non-toxic earth friendly product which work for 7-9 years in the soil and then breaks down to CO2, water and nitrogen.