Viagrow perlite plus vermiculite 4 cu. ft. bag each, combined to make approximately 8CF/236 Qt./60 US Gal. mix. The Viagrow horticultural grade perlite and vermiculite is a great mix and can be added to any soil or soilless mix to make an ideal premium potting mix. Viagrow Perlite increases drainage and aeration when added to soil and soilless growing media. Viagrow Vermiculite is a natural soil amendment that promotes moisture retention and aeration in potting mixes and delivers vital elements to the plant roots resulting in better root development, growth rates and yields. Viagrow perlite and vermiculite is a perfect horticulture mix for a customized planting medium or can be used for compost aeration. Viagrow Vermiculite #3 naturally attracts and holds positively charged ions, like potassium, magnesium, calcium and ammonium, releasing these vital elements to the plant roots. Viagrow vermiculite #3 has been developed with Successful Growing in Mind with a negative charge, it provides an excellent cation-exchange capacity which promotes healthy bacteria in your growing media, improves water retention, wettability, has pH stability in soilless mixtures and exhibits greater particle strength. For a great soilless mix combine 30% Viagrow vermiculite VER4 with 30% Viagrow perlite VPER4 and 40% Viagrow coconut coir VCCB5.