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Appropriate blackwater effect for tropical aquariums
Ammonia Alert's sensor changes reversibly from yellow to green to blue
ammonia binders
After color change is complete compare number of drops to ppm potassium chart below
Aqueon QuietFlow Replacement Filter Cartridge Small 3 pack Reef BioFuel Appropriate blackwater effect for tropicalAqueon Replacement Filter Cartridges are dual sided, featuring dense floss with over 25% more activated carbon than the leading brands. These patented cartridges were designed to ensure even distribution of activated carbon. To use, simply rinse under cold water and easily install using the FRONT orientation tab. Cartridge contains high quality activated carbon that keeps water clean. Installs in seconds: rinse first and align cartridge bottom key