Encap 10614-12 Iron Plus AST Pouch Covers, 2.5 Pounds, 1250-Square Feet Iron plus ast pouch covers These represent the top four skus for soil amendment and plant health Encaps garden solutions consist of fast acting lime and sulfur for quickly adjusting soil ph to the desired level Fast acting gypsum for improved soil structure and readily available calcium for strong vibrant plant life Measures 400-square feet cover