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Old 09-22-2017, 01:13 PM   #1
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Recommended RO/DI unit

1. I've got a 29G reef tank I've had for a month. I've been hearing that I definitely need a RO/DI unit. Up until now I've been conditioning tap water with Top Fin water conditioner. What unit do you guys reccomend? I plan on expanding later in this hobby so I rather buy an expensive unit now rather than upgrading later on.

2. Do you guys keep the RO/DI water stored somewhere for when you need it next? A little confused how the process might work foir myself.
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Old 09-22-2017, 01:53 PM   #2
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The water from an RODI unit comes through at a drip. So you need to drip the RODI water into a container of some sort. It can be something as simple as a 5g water container or as complicated as multi-stage 1000g water containment system. Personally, my RODI unit fills a pair of 50g barrels in my garage. It all depends how much water you need available at any one time.

You will want to use a float valve or equivalent to shutoff the flow of water when then container fills up. Often the RODI units made for reef keepers include these.

There are two pretty common recommendations here. The first is the Reef Keeper units from AirWaterIce. The second is the 5-stage or 6-stage RODI units from Bulk Reef Supply(BRS).
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Old 09-22-2017, 02:29 PM   #3
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Do you ever have problems with algae growth in the stagnant water?
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Old 09-22-2017, 04:10 PM   #4
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Do you ever have problems with algae growth in the stagnant water?
No. I am not an algea expert but I suspect this is because rodi water has 0 nutrients to support the algae.
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Old 09-22-2017, 04:45 PM   #5
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You really need rodi for a reef tank. All the crap in tap water will ultimately crash your tank and fuel rampant algae growth. Brs has some good units, I use a coral life. Make about 15 gallons at a time into my brute water barrel add salt and mix with a cheap Sun Sun power head for a few days before using. I usually make a batch every couple weeks. Like to have on hand. It has to stay very agitated while being stored. Temp match as well. You'll spend $300 anyways when it's all set up but its a must imo
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Old 09-22-2017, 04:47 PM   #6
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You really need rodi for a reef tank. All the crap in tap water will ultimately crash your tank and fuel rampant algae growth. Brs has some good units, I use a coral life. Make about 15 gallons at a time into my brute water barrel add salt and mix with a cheap Sun Sun power head for a few days before using. I usually make a batch every couple weeks. Like to have on hand. It has to stay very agitated while being stored. Temp match as well. You'll spend $300 anyways when it's all set up but its a must imo
Agitated meaning like having a powerhead in your RODI storage?
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Old 09-22-2017, 05:58 PM   #7
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Agitated meaning like having a powerhead in your RODI storage?
Correct
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Old 09-22-2017, 06:56 PM   #8
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Agitated meaning like having a powerhead in your RODI storage?
Unless you are adding something directly into your rodi storage container I don't think there is much value in keeping it agitated.
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Old 09-22-2017, 07:18 PM   #9
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What do you recommend for water storage? I'm thinking a 55g plastic drum. I wonder if I can pick something up at Lowe's or Home Depot.
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Old 09-22-2017, 07:23 PM   #10
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What do you recommend for water storage? I'm thinking a 55g plastic drum. I wonder if I can pick something up at Lowe's or Home Depot.
55g drum is what I use. Technically, two of them.

Old picture but this is the general idea:

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