Shale ceramsite: the best choice for home aquaponics
Shale is a natural rock formed after hundreds of millions of years of compression and dehydration such as clay, mineral sand, mud, and fine sand. Shale that has not been processed at high temperatures is often alkaline, while processed shale ceramsite becomes a lightweight, relatively high-strength, porous, and inert material under the action of high temperature, which only affects the PH value in the initial stage. , generally used in construction projects and water purification.
Compared with volcanic stone, shale ceramsite is much lighter in weight, and due to high temperature processing of 2000 degrees, the sharp edges are melted, so it is not as easy to hurt the hands as volcanic stone. In addition, due to the high cost of mining volcanic rocks, many "volcanic rocks" currently on the market are made of cement and pigments, which are often alkaline and easily contain heavy metals.
Compared with the most commonly used round clay ceramsite, the biggest advantage of shale ceramsite is that it only requires a little drying layer to ensure it does not float. In addition, there is a high possibility that sludge, carbon ash, etc. will be mixed with clay ceramsite during the manufacturing process, which may not necessarily be suitable for food production.
Compared with other substrates: such as building stones, river stones and other stones, it has the advantages of being light in weight, porous, and capable of retaining water.
Although the price is relatively high, I would call it the best substrate choice for home fish dishes.