16 Pack Filter Cartridge for Tetra Whisper Bio-Bag Filters, Medium Replacement Filter Cartridges for Aquariums Compatible with Tetra Whisper Filters 10i / IQ10 / PF10 and 20 Gallons ReptoFilter Ancient Greek Remedy Nitrogen is a major component

Nitrogen is a major component of chlorophyll where plants get their green coloring

This allows for extended monitoring and assessment of water quality over time

no worry about screwing up a meal

The stakes are weatherproof

model number: 1 - Pack + Extension

16 Pack Filter Cartridge for Tetra Whisper Bio-Bag Filters, Medium Replacement Filter Cartridges for Aquariums Compatible with Tetra Whisper Filters 10i / IQ10 / PF10 and 20 Gallons ReptoFilter Ancient Greek Remedy Nitrogen is a major componentBrand: Pryitier Features: Filter Cartridge for Tetra Whisper16pcs Medium Replacement Filter Cartridges, Unit Size: 3. 5 * 5. 5 inches. This aquarium filter cartridge is compatible with Whisper Bio Bag External Filter PF10 Whisper External IQ10 and Whisper 10i Internal Filter and TetraFauna ReptoFilter 20 gallons (90 GPH). Four Stage FiltrationThe filter is made of dense dual sided mesh, Better thickness provides better filtration, Ultra Activated