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Stagnant water in a chiller or cooler... a problem?

For those with a chiller ... I understand that a chiller sucks up the water from your reservoir, cools it and then the cooled water comes back into your res.
But if nothing needs to be cooled for some days, there will be stagnant water in the tube and in the chiller.
Does this never cause problems?
How do you keep it clean during your grow?
What precautions do you take to prevent the stagnant water for going bad? Does it run anyway for a few minutes every day for example.

July 20, 2019 at 12:34PM

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