PENN-PLAX presents the Small World Replacement Aquarium Filter Media Cartridges. These Media Cartridges are specifically designed for Small Word Filters (Model SWF1), allowing for simple and easy media replenishment, and are for aquariums, tanks, and habitats up to 5 gallons. Cartridges come in a 2 pack. Furthermore, they're safe for both Freshwater and Saltwater setups. Carbon & Zeolite Mixture: Supercharged with scientifically formulated Carbon and Zeolite Crystals, these replacement cartridges absorb ammonia, nitrites, nitrates, and phosphates in a fast and timely manner, along with removing harmful chemicals and toxins, clearing up discolorations, and reducing foul odors from your aquarium, tank, or habitat. Bio Sponge: In addition to the Carbon and Zeolite Crystals, these replacement media cartridges also contain a Bio Sponge for physical filtration of larger particulate matter, and biological filtration that optimizes the colonization of anaerobic bacteria. Cleaning & Maintenance: Before placing into your aquarium, tank, or habitat, please briefly rinse the media cartridge with warm water in order to remove Carbon or Zeolite dust. If not done before installation, the water could initially become dark or cloudy. Please Note: The Small World Replacement Media Cartridges (SWF1C) do not come with a Filter, Air Tubing, or an Air Pump – All Sold Separately. Measurements: Each Filter Media Cartridge measures 1.3" x 1.1" x 4.1"
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