Cobra 130 & 175 pre-filter foam Mechanical pre-filtration foam for internal filter Cobra 130 and Cobra 175. Retains impurities at the start of the cycle for efficient filtration. Mechanical filtration First stage of filtration Holds debris in suspension This foam is suitable for - filter AQUARIUM SYSTEMS Cobra CF130 - filter AQUARIUM SYSTEMS Cobra CF175 - NEWA Cobra 130 filter - filter NEWA Cobra 175