Gypsum Caves: Gypsum caves, also referred to as gypsum karst caves, kind throughout the dissolution of gypsum by groundwater. As marginally acidic drinking water percolates via gypsum-loaded bedrock, it little by little dissolves the gypsum, generating underground voids and passages. Hair or fibre and lime or clay might be extra https://www.propanraya.com/id/produk/eco-gypsum-ee-4050