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Old January 8th, 2013, 08:56 PM
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Default Letting an RO freeze

There was one speaker at Verona from a company that manufactures ROs. He clearly stated in his presentation that it was perfectly fine to let your RO freeze up. Now, I'm not an RO guy but this just doesn't add up for me. An RO passes sap through filters so fine that only water can penetrate them. If that water were to freeze would it not open up the space in the filter from expansion? What about all the various pipes and fittings? Would they not crack from ice expanding as it froze solid?

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Old January 8th, 2013, 09:52 PM
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Old January 8th, 2013, 10:05 PM
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I was told NEVER let it freeze and I cant see anything good that can come from any part of it freezing. I was told it would allow sugar to pass through the filter so thats bad.
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Old January 8th, 2013, 10:08 PM
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Haynes... this was a significant Canadian manufacturer promoting it... let it freeze, it will be okay.
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Old January 8th, 2013, 10:21 PM
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Freeze maybe slightly/but not solid. There is a way to get alcohol to seperate from the membrane by letting it freeze though i have read before.
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Old January 9th, 2013, 04:13 AM
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It seems to me that it is pretty logical to NOT let an RO freeze. The expansion of water to the ice state has to do damage to at least some parts of the membrane, not to mention fittings, gauge diaphragms etc. No way that freezing can be good by my way of thinking. I can see where nearly frozen might let you dodge the bullet, but it doesn't make sense to me to take the risk. I suppose if you sell them it might be to your benefit to see some frozen, might help your replacement sales figures. I definitely making plans to keep mine on the warm side of ice. What can it hurt to keep such a major investment safe?
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Old January 9th, 2013, 07:06 AM
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better hope it thaws out in time to run sap through it..... if it freezes up for 4 days and then the sap runs, that membrane will be solid. No thanks I will keep my nice and toasty.
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Old January 9th, 2013, 07:24 AM
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Quote:
Originally Posted by Bryan Ex View Post
There was one speaker at Verona from a company that manufactures ROs. He clearly stated in his presentation that it was perfectly fine to let your RO freeze up.
Was the speaker referring to ANY RO, or to the specific models that are designed so freezing doesn't harm them?
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Old January 9th, 2013, 12:31 PM
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Well he is in the business of selling ro's and membranes
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Old January 11th, 2013, 08:28 PM
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Quote:
Originally Posted by DrTimPerkins View Post
Was the speaker referring to ANY RO, or to the specific models that are designed so freezing doesn't harm them?
He was referring to his brand of ROs. Are there specific brands that make this claim? I just can't understand how a membrane can filter at the same level after water has expanded in the filter as it freezes. That alone would make the filter "open up" and not filter as tightly.
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