This is an Aqua Soil made from black dirt rich in organic elements and various nutrients. Organic elements contained in the soil are made up of mainly accumulated dead plant matter that was broken down by decomposers such as soil microbes. Therefore, the soil is rich in ammonia nitrogen that is produced in the process of the decomposition of organic substances, and organic acids such as humic acid and acetic acid that result from the decomposition of plant materials. Aquatic plants grow well in this substrate since these elements encourage the growth of the roots of aquatic plants and at the same time produce an environment in the substrate in which nutrients can be absorbed easily by the roots.
This is the newest Aqua Soil that is equipped with the excellent characteristics of other Aqua Soils. The raw material is black dirt, but the composition ratio of its constituents such as organic elements and clay is different from Amazonia. Therefore, its color is somewhat browner. Some reddish brown elements inside granules may be exposed occasionally, but it doesn't affect the growth of roots because the softness and air permeability of the substrate still remain the same. Although it is not superior to Amazonia for its ability to grow aquatic plants, it contains organic acids and nitrogen in a good balance that encourages the growth of the roots of aquatic plants, and aquatic plants grow well in it. This is a substrate material that does not lead to the discoloration of water caused by humic acid, which will be explained later.
This Aqua Soil is made from reddish soil. Although its organic elements and nitrogen content are not as high as Amazonia, it is far superior to marine sand in its ability to grow aquatic plants. It lowers the pH of water easily and has an excellent ability to adjust water quality.
This Aqua Soil is made from somewhat yellowish brown soil. It contains the least amount of organic elements and nitrogen among the Aqua Soil series. Its ability to lower pH is the highest and it enables you to maintain acidic water quality easily.