PennPerlite Horticultural grade perlite increases water absorption and aeration when added to soil and soilless growing media. Perlite is commonly used for a completely inert hydroponic medium with good capillary and air retention properties, and can be added to any medium to improve texture or combined with COIR (coconut fiber) and bulk granular fertilizers for a customized planting medium. Green house propagation and growing Hydroponic growing medium Outdoor gardening and landscaping Compost aeration Container and rooftop gardening Bio filtration Contains approximately - 4 cu. ft. /113 l/119 Qt. /29.9 US gallons and weighs 28.5 lbs.