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Old 01-18-2011, 09:05 PM   #1
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DI Needed in an RO System?

Hello everyone, new member, 1st post. Great forum BTW, I've learned a bunch. I was wondering how important deionization (DI) is to include in a RO system. An article archived here says the primary function of DI in salt aquaria is to remove phosphate ions.

I have water from a well dug into a forest floor w/ leaf litter (so it's acidic). My water is treated by a particle filter, an acid neutralizer (calcium ion xchange I think) and then the classic softener w/ resin bead/salt back flush system. (before going to the RO system). Do you think adding DI is worth the extra cost or over-kill in this situation.

I plan to use the water for my new salt/reef system, a fresh water system and some horticultural uses. Thanks - N83259
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Old 01-18-2011, 09:07 PM   #2
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Welcome to AA!

IMO it's always a good idea, and nowadays most RO units come with an option to include them. The cost is negligable and DI resin does quite a good job getting the last little bits of stuff out of the water.
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Old 01-18-2011, 09:14 PM   #3
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Welcome to AA! Check out this recent thread RO vs RO/DI? for more discussion on RO vs RO/DI. I don't know a lot about water purification so I can't help much with your specific situation but hopefully the thread answers a few of your questions.
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Old 01-18-2011, 10:58 PM   #4
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Thanks guys, good info. I'll pony up for DI for sure.
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Old 01-18-2011, 11:02 PM   #5
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I think that would be a good idea esp. if you plan on a reef.
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Old 01-18-2011, 11:07 PM   #6
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Always go the extra mile unless u can't afford it
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Old 01-19-2011, 05:43 PM   #7
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Portable Mini Reverse Osmosis DI/Ro Water System 4stage - eBay (item 280500946732 end time Jan-26-11 13:22:22 PST)


Any thoughts on this one?
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Old 01-19-2011, 06:04 PM   #8
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Personally I would go with a 5+ stage unit.

This is the unit I have and I have had no issues with it
100 G Aquarium Reef RO DI 5stage Reverse Osmosis Water - eBay (item 180544571860 end time Feb-04-11 21:47:21 PST)
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Old 01-19-2011, 06:09 PM   #9
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Just say no to the small RO units like that. You really want standard 10" units because the filters will be more common. those little units although initially less expensive will cost far more in the end. Bulkreefsupply.com has a great selection of standard RODI units.

DI is a must the water that comes out post RO is usually 2-5 TDS depending on supply pressure temp and TDS. The DI removes those last few TDS. Its also important to know the just having DI is not the answer. An appropriately designed DI is best, You want a vertical DI housing with removable media to prevent channeling (the water making a channel through the DI thus diminishing it exposure to the media itself). Quality water will make for a quality reef experience. What ever extras you put in with your water (heavy metals, organics, in organics) you have to design a system to export those extras out ie FUGEs, and UV, skimmers, chemical media filtration; so the less you put in with just your water changes the better. We add so much phosphat and the like just by feeding our fish no need to add it with your water change... does that make sense?

75 GPD RO/DI 5 Stage Standard System - English

Aquarium Water | Reverse Osmosis | RODI Water | ReefKeeper Water | Typhoon 5 stage RODI Reefkeeper 75 GPD

RO/DI Systems The ocean wave+
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