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Old 01-16-2011, 03:04 PM   #1
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RO vs RO/DI?

anyone know what the difference is and what the advantage or disadvantage of each system is?
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Old 01-16-2011, 03:13 PM   #2
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RO water uses filters and a RO membrane that the water goes through. A RO/DI unit uses filters, RO membrane and a Deionized unit.

This excerpt from Liveaquaria on the one I use explains it all.

"The 4-stage Maxxima RO/DI takes the full size RO to a higher level of filtration. The Maxxima is an excellent selection for reef enthusiasts and other serious aquarists, especially those who live in areas with exceptionally high levels of phosphates in their tap water. Includes: TFC (Thin Film Composite) membrane, carbon and sediment pre-filters, mixed-bed deionizing post-filter, with clear canister housings. The post deionizer takes the small percentage of contaminants that the membrane could not remove and filters this to greater than 99.9% pure."
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Old 01-16-2011, 03:21 PM   #3
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so whats necessary for a reef tank? the the deionizing unit necessary?
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Old 01-16-2011, 03:25 PM   #4
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If it was me I would use a RO/DI unit. I do use one. I use the coralife maxxima but they have cheaper versions on Ebay. You could get away with just an RO unit but it wont be as good as a RO/DI.
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Old 01-16-2011, 05:31 PM   #5
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If it was me I would use a RO/DI unit. I do use one. I use the coralife maxxima but they have cheaper versions on Ebay. You could get away with just an RO unit but it wont be as good as a RO/DI.
so what added benefit does the deionizer give you? what does it remove from the water that the RO doesnt?
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Old 01-16-2011, 08:38 PM   #6
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Quote:
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so what added benefit does the deionizer give you? what does it remove from the water that the RO doesnt?
the rest of the stuff you don't want.
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Old 01-17-2011, 01:05 AM   #7
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RO units will remove about 95% of the "stuff" from the water. If 95% pure is good enough, then you can stop at that point. But if you want 100% pure water, the DI part will remove the remaining 5% of "stuff" to give you 100% pure water. Without the DI part, you could still be getting nitrates, phosphates, etc... in your water - just in much smaller amounts than you originally had.
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Old 01-17-2011, 05:08 AM   #8
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you can find a 50-75 gpd (gallon per day) on ebay for $100. I bought a 100 gpd for $140
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Old 01-17-2011, 09:53 AM   #9
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The RO membrane will remove 90% - 98% of the total dissolved solids (tds) from the tap. The DI takes that to 100. So if your tap water has a tds 200, you will have 4 -20 tds water. The DI portion takes that to 0.
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Old 01-17-2011, 11:12 AM   #10
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If you are going to buy and set up the unit it would behoove you to go with the DI. I had an older RO ojnl6y that I added a DI to for very little cost. There is no good reason not to have di.
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