Aqua One PremiumSub is an extremely porous sintered glass biological media that can be used in all types of filtration systems such as pressurised canister filters, hang on filters, internal filters, and wet/dry filters. PremiumSub provides the most ideal environment for the cultivation of denitrifying bacteria, due to its porous nature. PremiumSub is a key component to a healthy and productive biological filtration system.

Suitable for: both freshwater and saltwater aquariums