Ista Stainless Steel Co2 Check Valve decoration Alkalinity (KH) and Magnesium (Mg) Convincing coral texture The Alkalinity (KH) and Magnesium (Mg) in a single kit CB2 and CB3) let you match the media to anything from a small filtration system to an expansive water feature it suits aquarists who need a durable check valve for standard 4 mm CO2 airline tubing It is intended for aquarium CO2 systems
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