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water change rate in raft systems

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Does anyone know how often people with large hydroponic DWC systems change out their water? When I was growing indoors I ran a small RDWC with a 50gallon reservoir and changed it out completely every 10-14 days (I topped off daily with RO water). This doesn't seem like a problem if you have a tiny indoor system but what if you had a larger system with 10-50x the amount of water?

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