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Old 08-20-2008, 12:34 PM   #1
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RO/DI units - which one?

I have a 34gallon Solana aquarium. I want to get a RO/DI unit. Can you suggest a type / manufacturer? My water changes are every 2 weeks and it's 5gallons - so I don't think I need a very fast one.

I'm looking on ebay - but wow, there are so many types! 4 canister, 2 canister, storage tank, guage etc...
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Old 08-20-2008, 12:53 PM   #2
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Since you only change roughly 100 gallons per year I'd personally recommend just using filtered water from a grocery store if it's available. Generally you can get refill water for about $.30-$.40 per gallon and keep it in the gallon jug containers. that would only be less that $30 per year for you seeing as how you'd want to mix the filtered water with tap water to get buffering capacity and some mineral hardness to the water. I'm not sure it's even necessary for you to have to buy filtered water let alone spend $75+ on an RO/DI unit. What are you keeping that you think you need special water?

FWIW the Brita filters and similar ones are capable of filtering 40-50 gallons of tap water and would still be less expensive for you than getting an RO unit if you wanted something available at home instead of having to refill at the store when you buy groceries. Generally RO/DI units are for people that change LOTS of water and people that are breeding. I change out about as much water in 2 weeks as you do in a year and I don't have an RO/DI setup. I keep discus/angelfish/red cherry shrimp in my water with a pH of 8.0, KH of 300 ppm, and GH of 300 ppm with no problems. My RCS colony is THRIVING and my angels look like they are going to breed in it too!
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Old 08-20-2008, 12:59 PM   #3
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wow... well i do have a brita filter... i just always read and hear horror stories of how you HAVE TO have ro/di or you will kill everything. I only have a cleaner crew and just put a green neon zoo and finger leather zoo in the aquarium... it's 95% going to be a reef tank. right now i've been purchasing rodi from LFS at .50 gallon... so sounds like I should just keep doing that!
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Old 08-20-2008, 01:17 PM   #4
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I didn't notice that you posted in the reef forum, my apologies. Lots of what I said pertained to FW but for SW I'm pretty sure that corals will need some "hardness" to the water. You won't want any chlorines/chloramines that's for sure. I'll let someone with far more experience in SW and corals chime in to help you. But if that's all it costs I'd continue to buy it from the LFS or grocery store if it's cheaper there (most likely is).
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Old 08-20-2008, 01:51 PM   #5
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If you don't mind lugging the water back and forth. There is no guarantee how "clean" the LFS water is and you have no control over that.
I would look at a 75GPD RO/DI unit.
This looks like a good unit:
http://cgi.ebay.com/Reef-Aquarium-RO...2em118Q2el1247
It even explains how it works. I would shoot for the ones with clear canisters so you can see the filtration.
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Old 08-20-2008, 01:55 PM   #6
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They make them as as low as 35 gallons per day. I would suggest getting one. Between top offs and PWC`s you`ll use more than you think. JMO
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Old 08-20-2008, 04:25 PM   #7
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wow... well i do have a brita filter...
Just FYI, a brita filter doesn't give you pure water. Depending on your source water, it probably only knocks 1/2 of the "stuff" out of the water. Better than tap, but not RO/DI by any means.
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Old 08-20-2008, 04:35 PM   #8
Thanx but no.....


 
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Mine : ---> http://cgi.ebay.com/AQUA-SAFE-AQUARI...742.m153.l1262

I only run one of the DI's at a time and it comes with 3 filled tubes
My tap TDS runs 140-160 .. My RO/DI= 0

LOVE this unit. It's performance and it's price point
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Old 08-20-2008, 04:39 PM   #9
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I'm pretty sure that corals will need some "hardness" to the water.
That's what the salt is for. It has all the needed minerals in the right balance. The purer the water used with the salt, the better.
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Old 08-20-2008, 04:44 PM   #10
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I like the Reefkeepers at http://www.airwaterice.com

I don't own one, but it's on my wishlist.

There's the compromise solution of buying your own TDI meter, and testing the water you buy for quality. You can always talk to the manager of the store about maintaining the filter if it drifts out of spec.

You are not likely to kill anything using tap water instead of RO/DI, but you will be much more likely to be fighting algae, and RO/DI will filter out most contaminants that may creep into the tap. I have heard stories of people doing fine on tap water for a long time, and then having sudden major problems when the city/county changed something in the water.
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