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Old 11-16-2012, 02:20 PM   #1
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Small FOWLR tank, RO/DI necessary?

I'm going to do a small (20 gallon) FOWLR tank, with 2 clowns and a small cleanup crew.

Will treating the water with Prime be sufficient, or is using RO/DI really required? (I already use Prime in my 2 freshwater tanks).
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Old 11-16-2012, 02:52 PM   #2
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Prime won't do anything about the metals and phosphates in the tap water. Regardless of tank size, RODI is always the way to go. Algae issues will most certainly occur with tap water.
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Old 11-16-2012, 03:14 PM   #3
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Originally Posted by Benamayer View Post
Prime won't do anything about the metals and phosphates in the tap water. Regardless of tank size, RODI is always the way to go. Algae issues will most certainly occur with tap water.
Is DI needed in addition to RO? And for a 56 gallon fresh and 20 gallon marine, I'm guessing a small gpd would suffice for my use, correct (assuming 25% changes in each every week)?
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Old 11-16-2012, 03:25 PM   #4
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For the small diff in price, I would do RODI. A lot of them will make water out of the RO at 10-20ppm TDS, which is still kinda high. In order to come out at 0ppm TDS it would need the DI. And in terms of gpd, mine is 75. I would check out bulk reef supply and try to get into a group buy. The 5 stage plus comes with an inline TDS meter, pressure gauge, RO membrane flush kit, and sink adapters, and is under a couple hundred bucks...
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Old 11-16-2012, 04:57 PM   #5
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Take my advice and take the safer, smarter route. Go with RO/DI to make sure you have pure water. That eliminates most of the possibility of putting water in the tank that can cause problems. I bought a 100 gallon per day portable unit for less than $70 and it lasted almost a year before I had to change the filters. If you get one I would also get a TDS meter to monitor the water quality.
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Old 11-16-2012, 04:59 PM   #6
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Take my advice and take the safer, smarter route. Go with RO/DI to make sure you have pure water. That eliminates most of the possibility of putting water in the tank that can cause problems. I bought a 100 gallon per day portable unit for less than $70 and it lasted almost a year before I had to change the filters. If you get one I would also get a TDS meter to monitor the water quality.
whoa, where did you get a rig like that for $70? I've seen 50-75 gpd units for $180-ish...
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Old 11-16-2012, 05:23 PM   #7
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whoa, where did you get a rig like that for $70? I've seen 50-75 gpd units for $180-ish...

Ebay - This one is $66

0ppm Portable 100GPD Reverse Osmosis Ro Di Filtration | eBay
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Old 11-16-2012, 05:28 PM   #8
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Definitely on the cheap side... Just keep in mind the things you may want to add on. Pressure gauge, TDS meter, sink adaptor, etc... Looks inexpensive for a reason, just sayin.
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Old 11-16-2012, 05:29 PM   #9
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Definitely on the cheap side... Just keep in mind the things you may want to add on. Pressure gauge, TDS meter, sink adaptor, etc... Looks inexpensive for a reason, just sayin.
Yeah, and I saw some reviews of other portable systems that the replacement filter cartridges can cost more because they are smaller and not standard sizes. Before I drop a penny on RODI, I need to figure out where to install it; I think I have room in the laundry room, but I need to make sure...
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Old 11-16-2012, 05:33 PM   #10
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You don't need to install it anywhere if u don't wanna...I use mine then put it away after...

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