REPLACEMENT FILTER CARTRIDGE: Keeps aquarium water clear – removes odors and discoloration and helps reduce buildup on aquarium glass.|STAY CLEAN™ TECHNOLOGY: By maintaining healthy pH levels, creates easier maintenance for healthier fish.|FITS TETRA® WHISPER® AQUARIUM FILTERS: Color coded to make it simple to remember which cartridge size to purchase.|CONVENIENT: Pre-assembled, ready to use and easy to replace.|USAGE: Change monthly or sooner if needed.

REPLACEMENT FILTER CARTRIDGE: Keeps aquarium water clear – removes odors and discoloration and helps reduce buildup on aquarium glass.|STAY CLEAN™ TECHNOLOGY: By maintaining healthy pH levels, creates easier maintenance for healthier fish.|FITS TETRA® WHISPER® AQUARIUM FILTERS: Color coded to make it simple to remember which cartridge size to purchase.|CONVENIENT: Pre-assembled, ready to use and easy to replace.|USAGE: Change monthly or sooner if needed.