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What is the red knob on the Katadyn Combi filter for?

April 26, 2017combi filter katadyn Knob red

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What is the red knob on the Katadyn Combi filter for?

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The red knob is to remind you when to replace the activated carbon granulate. The carbon should be replaced after using it for six months. Turn the red knob to the appropriate month, this makes it easy to know when it is time to replace the carbon. A coin will help you turn the knob.