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RODI DI Resin beds, how many stages do you use? (1 Viewer)

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SCUBAFreaky

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I am contemplating going from a single DI Resin bed to a triple set up with separate Anion and Cation beds along with a final mixed resin bed.

How many DI Resin bed stages do you run and why?
 

jrounding

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I just upgraded. Due to space constraints I didn’t have room for the triple cartridge. I added two cartridges to the system. I’m now running two carbon block before the RO because we have chloramine. For my resin I’m running BRS pro anion (blue) and a BRS pro mixed bed cartridge (purple). If you run the same setup as me make sure your color change for your mixed bed is cation. Apparently the anion depletes 5X faster than the cation generally. I’m getting 9 TDS out of my RO and 0 TDS out of my resin. I cannot comment on my resin life yet, because I just upgraded. If you have the room get the triple get it, but If you are short on room get the Anion+mixed bed. Anion removes phosphate, chloride, silicate, nitrate and phosphate. Cation removes sodium, calcium, magnesium, and metals.
 

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Cody

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I have three DI cannisters but I only fill one or two of them for now. I have a good amount of mixed bed that I need to use before I switch over to anion, cation, then a single mixed bed. Why? Because I needed three cannisters for symmetry, and I get bored with doing the same old stuff sometimes.

This pic is prior to it being finished. I’ve had to move it for the time being for construction reasons but it should be back on the wall soon, all polished up.

9778D41A-89A2-4B4F-89CC-8DABAB5C52E6.jpeg
 

RR-MAN

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Hard to see from the pictures - is there enough room to use a filter wrench to remove the canisters @Cody
 

BigRick

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Hard to see from the pictures - is there enough room to use a filter wrench to remove the canisters @Cody
Easily.. the canisters brackets are external so no different then setting up a regular setup. The the real magic is the hidden sensors between stages behind the wall. Cleans it up a lot. Same setup basically as mine just very well thought out and cleanly built. I spent 15 mins.. he's probably on 3 hrs..
 

Cody

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Easily.. the canisters brackets are external so no different then setting up a regular setup. The the real magic is the hidden sensors between stages behind the wall. Cleans it up a lot. Same setup basically as mine just very well thought out and cleanly built. I spent 15 mins.. he's probably on 3 hrs..
Yeah the back-stage part is cluttered and messy, but that was by design. My goal is to finish the fish room expansion by Christmas so that I can get the full situation up and running. However, when it gets dark at 5pm and everything is wet and cold, it really does a number on my motivation. I'm notorious for not building much past October/November.
 

mitchell77546

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Two mix beds and spectrapure silica buster. Thinking about going back to 75GPD as per Andre’s recommendation. It does make sense to have more contact time with a slower flow rate. I only run a 120 and a 20AIO so I don’t use much water given I rarely do W/C.
 

jrounding

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So turns out I was incorrect. It’s the cation that depletes fast. My new setup the mixed bed cartridge is already changing color, but my anion is still all blue. I am going to add a cation stage so my mixed bed doesn’t deplete so fast. Then I can stop throwing away so much resin.
 

BigRick

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So turns out I was incorrect. It’s the cation that depletes fast. My new setup the mixed bed cartridge is already changing color, but my anion is still all blue. I am going to add a cation stage so my mixed bed doesn’t deplete so fast. Then I can stop throwing away so much resin.
That's why I flush between each stage cause even though I get to 3-4 ppm out of the RO Membrane (Dual 75gpd), the Cation sometimes spikes to 14 for a couple minutes before getting down to 1 or 2. My Final stage has turned from blue to almost fully brown now but still reading 0 .... @400 gallons now... Anion still blue and reads 0.
 
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jrounding

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If I remember correctly you have to run cation before anion or the anion does not work. Something about it causing the ph to change.
Yeah, I guess I am just confused. If you need a cation before the anion then why would they sell the kit that is anion and then mixed bed. Doesn’t really make any sense to me, but I guess I will just add the third cartridge and move on with my life.
 

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Yeah, that is weird. Pretty sure they are the ones that did a video saying you have to put cation first or anion will not work well. If you find their video it probably explains it.
 

jrounding

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Yeah, that is weird. Pretty sure they are the ones that did a video saying you have to put cation first or anion will not work well. If you find their video it probably explains it.
Yeah, the issue is I don’t have room for three in a row like the “pro” system. So I bought an individual DI cartridge to run after the RO and then I can feed my dual cartridge from that.
 

jrounding

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Finished this tonight. I have a sediment filter, 2 carbon blocks, dual RO membranes, cation, anion, and then a mixed bed. Essentially it’s the BRS pro system. I also flipped the inlet/outlet direction on my first three cartridges so water now comes in from the back of the cabinet and out the front directly into the DI membranes. I eliminated a bunch of tubing and by doing so it has decreased my pressure drop to my RO membranes and improved my flow at the outlet. That 1/4” tubing is really restrictive stuff.
 

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Cody

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Two mix beds and spectrapure silica buster. Thinking about going back to 75GPD as per Andre’s recommendation. It does make sense to have more contact time with a slower flow rate. I only run a 120 and a 20AIO so I don’t use much water given I rarely do W/C.
Is a 75 gpd membrane really his recommendation? Why? I’m sure the argument he has to make is more complex than what you presented but what you said makes as much sense as a square plug going through a round hole. 0tds is 0tds is 0tds.

I’m having “quality” of light argument flashbacks now where someone was saying there’s different “quality” of light. Photons are photons, and 0tds is 0tds.
 
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