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The chemical stage for the Marina Underwater filter. Each cartridge combines zeolite, which adsorbs ammonia, with activated carbon, which lifts discolouration and odours — the two things that make otherwise healthy water look and smell tired. Two per pack.
Using it
- Replace monthly. Both media exhaust; a spent cartridge does nothing.
- Take it out while medicating — carbon strips most treatments from the water.
- Match the size to your filter: 50, 75, 100 or 150.
Mechanical media for the same filter: replacement foam.
