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Old 11-23-2006, 05:37 PM   #1
Jme
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Culligan Machine at Grocery store.. is it RO/DI

like the topic asks.. anyone know if this is RO/DI water out of the "Culligan" machine at the store? It says its filtered through carbon, then a membrane and then its put through a UV filter. Just making sure this is good for my tank?
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Old 11-23-2006, 07:01 PM   #2
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From your description it sounds like RO water.
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Old 11-23-2006, 08:34 PM   #3
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I would recommend that you ask the store manager or call the culligan that is responsible for the care ot that machine , they will tell you if it is or not ...Then ask to see the maintince log to make sure it is regularly serviced ...
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Old 11-23-2006, 09:04 PM   #4
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We don't have a Culligan Machine in our area, but Im assuming if it's anything like ours they are just tap water filters, which still uses a membrane but doesn't deionize the water like a RO/DI unit does. But then again....I might be wrong, so lets hear what everyone else has to say.
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Old 11-23-2006, 09:13 PM   #5
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If it has a membrane then it is likely an RO system. How good it is set up and kept up is a good question. You might want to get a sample and test for nitrates and phosphates.
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Old 11-23-2006, 09:20 PM   #6
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Quote:
Originally Posted by melosu58
If it has a membrane then it is likely an RO system. How good it is set up and kept up is a good question. You might want to get a sample and test for nitrates and phosphates.
Good point
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Old 11-24-2006, 12:30 AM   #7
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i have a similar machine near my house, there was a last serviced tag on it. it read 04, so i went to the water store instead, it's only .30 a gallon and i know it's good.
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Old 11-26-2006, 10:53 AM   #8
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Those machines are designed to produce drinking water - they use RO, but no DI.

Russ @ BFS
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Old 11-26-2006, 11:34 AM   #9
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So, excusing my ignorance, RO (reverse osmosis) is the passing of water through a membrane to remove any particulate matter, and DI (de-ionization) is removal of phosphates and other impurities? Because the water machine says it uses carbon filters, isnt this how you De-ionize water by using activated carbon? Sorry, as you can see im certainly no expert....
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Old 11-26-2006, 12:26 PM   #10
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Jme - you're generally on the right track, but not quite.

Carbon is used ahead of TFC RO membranes to remove chlorine and other volatile organic compounds.

Reverse Osmosis uses a semi-permeable membrane to filter out 90%+ of molecules larger than water. So it filters out particulates down to the molecular level.

Deionization is typically used as a polishing stage after RO. It captures ions that made it through the RO membrane.
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