Check the listing for details. The Environmental Factor Spongelei Water Retention Crystals, 1lb. Condition: New. Listed at 26.82 USD. The Environmental Factor Spongelei Water Retention Crystals, 1lb PRODUCT DESCRIPTION Spongelei increases plants available water holding capacity, aeration balance, and alters the structure of soil and potting mixes.Product DetailsCrystals swell to absorb water, increases water holding capacity of soils, reduces frequency of watering up to 50 percentReduces water stress in plants and helps protect plants during hot weather or droughtEnvironmentally friendly, biodegrading into potassium, CO2, and waterHelps prevent over-and under-wateringIdeal for indoor and outdoor plantsReduces water stress in plants and helps protect them in times of hot weather or drought. Spongelei watering crystals absorb water, similar to a sponge and slowly releases moisture as the surrounding soil dries out. Ideal for indoor and outdoor plants. Helps prevent over and under watering. Mix with soil to reduce the amount of watering needed. Crystals swell to absorb water. Environmentally friendly, biodegrades into potassium, CO2 and water.