This product is suitable for various water filtration systems, six layers of water purification cotton High density, non-toxic and harmless, made of environmentally friendly materials Honeycomb hole design, effectively filter impurities Quickly establish a nitrification system to stabilize the culture environment

6 filtration water purification design
1^st Layer 3D Mesh
2^nd Layer Precision Mesh
3^rd Layer Glue free nano bio chemical red/blue sponge
4^th Layer Fiber bio chemical cotton 900 microns
5^th Layer Activated Carbon Precision Mesh
6^th Layer 3D Mesh