A couple of RO filter questions... - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 01-09-2009, 08:56 PM Thread Starter
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A couple of RO filter questions...

I'm thinking of purchasing a 5-Stage RO/DI filter, and I had a couple of questions:

1) Which part of RO/DI removes chlorine & chloramines..?

2) Does RO/DI remove excess dissolved gasses..? My water fizzes for days after a big water change. Looks like milk coming out of the tap sometimes.

3) This question is a bit longer. A couple of years ago, I happened across a DI cartridge referred to as...I think..."hydrogen Zeolite". It's a type of DI cartridge that is re-charged with HCL acid, and instead of removing the various GH minerals and replacing them with sodium chloride, the ions get juggled around and end up with H20 instead...

...so does anyone know anything about this..? I've Googled it and haven't found anything on it. I think I may have remembered the name wrong.

Thanks.
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post #2 of 7 (permalink) Old 01-10-2009, 07:24 PM
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Originally Posted by spinjector View Post
I'm thinking of purchasing a 5-Stage RO/DI filter, and I had a couple of questions:

1) Which part of RO/DI removes chlorine & chloramines..?
The carbon prefilter stage (usually 3), chloramines usually require the use of specialized carbon. Most RO units remove chlorine, not chloramine. You must check if your water supply use chloramine.

Quote:
2) Does RO/DI remove excess dissolved gasses..? My water fizzes for days after a big water change. Looks like milk coming out of the tap sometimes.
No, I believe it will not remove CO2. But RO is usually stored in a large collection drum to bring it up to temperature, use an air pump/powerhead to degass the stored water.

Quote:
3) This question is a bit longer. A couple of years ago, I happened across a DI cartridge referred to as...I think..."hydrogen Zeolite". It's a type of DI cartridge that is re-charged with HCL acid, and instead of removing the various GH minerals and replacing them with sodium chloride, the ions get juggled around and end up with H20 instead...

...so does anyone know anything about this..? I've Googled it and haven't found anything on it. I think I may have remembered the name wrong.
It's a DI unit with separate cation and anion chambers, hence it allows them to be recharged with HCl and NaOH as opposed to the widely available mixed bed resin.

http://www.thefilterguys.biz/kati_ani_di-onizer.htm or Kent Marine make the DEION 200R which is affordable, but I'd recommend this only if you have really soft tap TDS (100 or below).
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post #3 of 7 (permalink) Old 01-16-2009, 03:36 AM
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Stupid question, what is DI?

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post #4 of 7 (permalink) Old 01-16-2009, 03:39 AM
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Deionization

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post #5 of 7 (permalink) Old 01-16-2009, 03:47 AM
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Thanks, Craig. Great link. From what I read, both of these are like a type of purifying water, correct?

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post #6 of 7 (permalink) Old 01-16-2009, 03:56 AM
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That's correct. look up Reverse Osmosis or RO/DI.

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post #7 of 7 (permalink) Old 01-16-2009, 05:13 AM Thread Starter
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Thanks, Raul..!!

I checked out the link you indicated, and that's exactly what I was looking for. After reading the web page, I see that my memory of the device(s) was incomplete. Now I know the proper name and process, and I will be able to look around for the same system from different companies and see how they each do it.
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