Black Biochemical Cotton (Coarse Hole) 50×50×2cm

This Black Biochemical Cotton filter pad features a coarse hole structure measuring 50×50×2cm. It is specifically designed with a microporous structure that allows excellent water permeability while preventing water stagnation, making it ideal for aquarium filtration systems. Key features: • Coarse hole structure for optimal water flow • Dimensions: 50×50×2cm • Microporous design for enhanced water permeability • Prevents water stagnation • Black color • Durable biochemical cotton material The filter pad's specialized microporous structure enables high water transparency while maintaining proper water flow without blockage. The coarse hole design helps prevent the buildup of debris while allowing beneficial bacteria to colonize, supporting effective biological filtration in aquarium systems.