The Marina i110 /i160 Replacement Power Cartridge is made specifically to fit inside the Marina i110 and i160 internal filters.
The outside of the power cartridge features polyester foam to trap fine particles; while the inside chambers contain carbon to remove pollutants and odors; and zeolite to eliminate toxic ammonia for a cleaner, healthier aquarium environment and crystal clear water.
For model i160: do not replace both cartridges at the same time in order to ensure constant presence of beneficial bacteria.
Key Features :

2-pack
Provides mechanical, biological, and chemical filtration
Polyester foam traps fine debris; carbon removes pollutants and odors; and zeolite eliminates toxic ammonia
Easy to replace
Designed to fit the Marina i110 and i160 Internal Filters (A301, A306)

Note : For best results replace every 4 weeks.,