Gypsum Caves: Gypsum Caves, also referred to as gypsum karst caves, form with the dissolution of gypsum by groundwater. As somewhat acidic water percolates by gypsum-wealthy bedrock, it little by little dissolves the gypsum, developing underground voids and passages. Gypsum normally takes up to 3 months to break up clay https://www.propanraya.com/id/produk/eco-gypsum-ee-4050