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Should RO'S be left with water in or not?


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As the title states, should the RO'S be left containing water or are they OK dry? I have an auto cutoff solenoid valve and when full cuts off the water and the membranes drain of water until needed next? 


Is this good or bad practice? 

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I think generally the majority of the water may drain out of them but they will still be wet/ damp for weeks , if not used so don’t see a problem. Just give them a flush through for a few muinits before filling that’s what I have done fir the last 15 + years and never had a problem only changed the membrains even 7-8 years ,so must be doing something right ???

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