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Old 08-31-2012, 08:27 PM   #1
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RODI question?

I have a question about RODI system what are the parts called to it? Like the top part because i Have the sediment filters i just dont have the top part.
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Old 08-31-2012, 08:34 PM   #2
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The top part is generally the "membrane" the actual reverse osmosis filter, then after that there is a DI (de-ionizing resin) chamber. You can get either of eBay, make sure to get clips with them if you don't have them already.

Here's the housing for the RO membrane- http://item.mobileweb.ebay.com/viewi...id=70806372063

Here's the actual membrane, this one is a filmtec 100gal per day, check what your setup is supposed to be although I believe they are dependent on the membrane meaning if you put a 100gpd membrane in there then your whole system will put out 100gpd, and likewise if you put a 50gpd.

Membrane-
http://item.mobileweb.ebay.com/viewi...id=90601022359

Even though I don't believe that filter you have in the pic comes with a DI stage you could add one cheaply and get 0tds water, if you just run RO you will have around 10-20tds.

De-ionizing resin cannister-
http://item.mobileweb.ebay.com/viewi...id=32500767003

Add clips if you buy this, I think they are like +$2.
All of this will be easy to install, you may need a few feet of the water line from lowes or home depot.
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Old 08-31-2012, 08:41 PM   #3
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So thats all I will need is the housing for the membrane and the membrane?
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Old 08-31-2012, 08:46 PM   #4
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I added some more info to my first post. If you have the housing for the RO membrane then disregard that first item.

And I believe that system is only RO so it will remove like 98% of the stuff from your water. So for example my tap water runs around 150-170 TDS , with just RO filter I get like 10-12tds out , with DI resin cannister I get like 0-3 TDS out.

I would also get a dual inline TDS meter.

Like this- http://item.mobileweb.ebay.com/viewi...id=96176639811

That way you can monitor your filter and make sure your filters are good and don't need to be changed, because filter life will depend on how dirty your water is to begin with and how much you use. So could pay for itself in changing filters.

I bought all this stuff myself and added it to a similar setup I bought. Less the membrane I already had that with my kit. Read up on the membranes, there are only about 3 manufacturers of these things and they are a little different, so you may want a 50gpd instead of 100gpd, I've read it makes a difference. Like 100gpd are not as good, but 150gpd are pretty good because they usually use 2 75gpd membranes. I don't know just read up on it a little bit.
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Old 08-31-2012, 09:00 PM   #5
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Also call your water utility and ask them what your water pressure is, if it's less than 40psi, you probably need a booster pump, if it's higher than 75 psi you may need a reducer.
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Old 09-01-2012, 11:25 AM   #6
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Ok will do thanks
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Old 09-02-2012, 10:23 AM   #7
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Quote:
Originally Posted by Saratj1 View Post
...And I believe that system is only RO so it will remove like 98% of the stuff from your water. So for example my tap water runs around 150-170 TDS , with just RO filter I get like 10-12tds out , with DI resin cannister I get like 0-3 TDS out...
A 98% rejection rate would convert 170ppm TDS tap water to about 2-3ppm TDS RO water (an effective DI resin stage would further reduce that to 0ppm for the RO/DI product water).

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Old 09-02-2012, 10:40 AM   #8
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Originally Posted by kay-bee19

A 98% rejection rate would convert 170ppm TDS tap water to about 2-3ppm TDS RO water (an effective DI resin stage would further reduce that to 0ppm for the RO/DI product water).
I realize the math, but these are the actual numbers I got with my RO membrane, so not quite 2-3tds. I get 2-3 TDS with DI resin, I only got 0 for like the first week.
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