$129.00 Mushroom Compost (Super Sack) quantity Add to cart Categories: Retailer Soil and Additives Tag: Super Sack Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Tumblr (Opens in new window) Description Working compost into your soil improves drainage and adds nutrients.