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Make sure this fits by entering your model number. Oyster shell provides a long-lasting, steady release of nutrients to help regulate pH levels, improve fertilizer uptake, promote healthy cellular structure and enhance soil tilth Oyster shell is also helpful in creating more active habitats for soil microbes in compost piles and worm bins Apply 4 to 6 lbs per 100 square feet Additional application rates included on package 6 lb box