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Old 08-22-2013, 06:27 PM   #1
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Default Need input on RO/DI system

Is this a good RO/DI system?

http://www.goreef.com/Vertex-Deluxe-...em-200GPD.html

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Old 08-22-2013, 08:11 PM   #2
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It's probably fine. I've heard that DI is not really necessary for beermaking, so it might be overkill. I know someone who bought one from Bulk Reef Supply for like $130 and it seems to be doing pretty good for her so far. And she makes quite a lot of beer...

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Old 08-22-2013, 08:18 PM   #3
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I would personally check on eBay... and I don't think you need the DI section.

I always used this system with my reef tank and it provided water with 0 total dissolved solids (which I don't think is a good thing for beer)

http://www.ebay.com/itm/AQUARIUM-COR...item2eb7e2b7e4

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Old 08-22-2013, 09:44 PM   #4
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I was led to think, from reading Yooper's posts, that DI water wasn't a bad thing since you could then build your brewing water from scratch. Opinions?

I have a deal for one at 150$.

I would like to use this for drinking water also, but drinking deionized water is not recommended. Can I modify it to go to the kitchen faucet after RO? I tend to believe so according to the schematic found here:

http://www.vertexaquaristik.com/Port...kManual200.pdf

If I install this on my kitchen faucet, will it reduce the water pressure?

Will it eliminate chloramines after RO or just after DI?

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I smoke, sit in traffic with my windows down, and eat bacon by the pound. Sometimes all at once. Food grade has become a myth to me...
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Old 08-22-2013, 10:35 PM   #5
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RO does the first 98% of the work. DI does the last 2%, and is unnecessary for brewing purposes. DI is fine if you've already got it, but by all means don't pay for it just for brewing. 0% vs 2% of original ion content is virtually a rounding error as far is a brewer is concerned. Might as well be the same thing.

And also by all means, don't spend $500 bucks on an RO system. 150-200 gets you a great system. A 75 GPD Dow-Filmtec membrane gives me 98.5% rejection and closer to 100 GPD. It is also widely considered the best small residential membrane you can buy.

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Old 08-23-2013, 12:14 AM   #6
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Quote:
Originally Posted by Homercidal View Post
It's probably fine. I've heard that DI is not really necessary for beermaking, so it might be overkill. I know someone who bought one from Bulk Reef Supply for like $130 and it seems to be doing pretty good for her so far. And she makes quite a lot of beer...
I think that you're talking about me? (It's the "she makes quite a lot of beer- I don't think you know too many women who make a lot of beer and bought the same RO system.......)

I bought mine for $119, but it's $129 now. Here's something like I have: http://www.bulkreefsupply.com/brs-4-...tem-75gpd.html but I got a "no DI" one that was a bit cheaper.

You don't need the DI, as the RO is close enough and cheaper!
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Old 08-23-2013, 02:23 AM   #7
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You definitely DON'T want to take out all the ionic content of the tap water and then add it back in. Including DI stages is overkill. In fact RO is overkill for most water supplies. Where the water is suited, a 'coarser' technology called nanofiltration is preferred for creating a water supply for brewing. It uses less energy and wastes less water. However, you can't get nanofiltration membranes in the typical home system size. You would have to get a very large capacity system to be able to use nanofiltration membranes. So, we are stuck with RO for now with small systems.

Since we do want ions in our brewing water, it makes no sense to remove them all with DI process. The most important thing is to understand what ions ARE in the final RO water and build from there.

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Old 08-23-2013, 03:05 AM   #8
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Quote:
Originally Posted by ph0ngwh0ng View Post
I was led to think, from reading Yooper's posts, that DI water wasn't a bad thing since you could then build your brewing water from scratch. Opinions?
This gives you ultimate control over the ion content of your brewing water and eliminates, (for the most part with RO, completely with DI) , the effects of variations in the quality of your supply with season, purchase of water by your municipality from multiple sources etc.


Quote:
Originally Posted by ph0ngwh0ng View Post
I would like to use this for drinking water also, but drinking deionized water is not recommended.
Other than the fact that it tastes pretty flat I can't see anything wrong with drinking RO water. I drink it all the time as do many people.

Quote:
Originally Posted by ph0ngwh0ng View Post
Can I modify it to go to the kitchen faucet after RO?
Most RO systems get plumbed to a separate faucet. This is generally just simpler to do and as a separate plumbing run is made one can use the corrosion resistant tubing that is required for low ion water.


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Originally Posted by ph0ngwh0ng View Post
If I install this on my kitchen faucet, will it reduce the water pressure?
There is a large pressure drop across RO membranes. If the processes water needs to be available at pressure then it must be pressurized somehow. In the simplest systems the output side of the membrane goes directly to a bladder tank. As the tank fills its internal pressure goes up, the pressure across the membrane goes down and the permeate produced per unit time goes down. In other systems the permeate is stored in an 'atmospheric tank' i.e. one open to atmospheric pressure thus insuring maximum pressure across the membrane and maximum permeate flow rate. Treated water from the atmospheric tank is then pumped directly to a bowser (similar to systems used in boats and RVs) or to a bladder/pressure tank.


Quote:
Originally Posted by ph0ngwh0ng View Post
Will it eliminate chloramines after RO or just after DI?
It is essential that chlorine and chloramines be removed from the water before it reaches the RO membrane which would be poisoned by it. Systems, therefore, contain carbon filters upstream of the membrane. If the system you install does not have such a filter you must install one.
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Old 08-23-2013, 11:14 AM   #9
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ajdelange, I won't forget about you in my will. Never has one of my posts been answered so thoroughly. Brings a tear to my eyes...

So I understand that the output of these machines is a bit like the one of a water filter equipped fridge, since the system I'm looking at doesn't have a pressure tank.

I haven't found any water diagnostic service where I live that is cheap enough.

Having all the ions removed would be a good thing for me, I guess, because my municipal water's ion content isn't constant. That way, I would be able to completely shape the water to my needs, and have a stable water profile. And, the system I want to buy is cheap, 200GPD and RO/DI. Overkill, maybe, but since it's cheaper for me, even though it's used (shipping charges are huge since I live in Canada, eh!)

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Old 08-23-2013, 11:43 AM   #10
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I still dont want to tackle the job of learning water..... but guess I need to.

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