Master Soil is a type of high-quality substrate used in aquariums and planted tanks. It is designed to provide essential nutrients to aquatic plants and promote healthy root growth. The substrate is made from a special blend of natural minerals and organic matter that helps to maintain a stable pH level in the tank. Master Soil is also known for its ability to improve water quality by absorbing harmful substances and preventing the growth of algae. It is a popular choice among aquarium hobbyists who want to create a healthy and thriving aquatic environment for their fish and plants.