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What’s up with my rodi (1 Viewer)

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steveb

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Replaced my 2x150g ro cartridges along with chloramine and sediment on Franken Filter a few weeks ago.

I just replaced my mixed bed resin yesterday.

Made around 120g of water yesterday/overnight.

Already I’m seeing the first DI cartridge about 50% exhausted.

I was thinking maybe there is an issue with RO filters but water going into DI filters is 7-8ppm.

What gives? I’m going through di resin like a...<you fill in the phrase>...

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@Buckeye Hydro Russ any thoughts?

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RR-MAN

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The high ammonia in the incoming water is destroying di resin-it’s all over Houston.

I have the same issue-just changing the di resin more often
 
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steveb

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RR-MAN said:
The high ammonia in the incoming water is destroying di resin-it’s all over Houston.

I have the same issue-just changing the di resin more often
Click to expand...

Is the ammonia coming from chloramines?

I have a chloramine filer and an additional carbon block.


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gregg

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just today i replaced 2 membranes, a sediment, 2 clorimite blockers (carbon) and 2 di resins... and as a result i got 11 ppm
 
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steveb said:
In series


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Click to expand...
Russ @Buckeye Hydro told me this: “Another thing you might do if you want the best RO water quality going to the DI - plumb your two membranes in parallel, not in series.

Yes - the Filmtec 75's have the highest rating of any residential RO on the market.”
 
Buckeye Hydro

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In series is OK if you have soft water and adequate pressure. Otherwise, plumbing in parallel will get you the higher (faster) production you might be after.

Plumbing membranes in series with no knowledge of your feedwater chemistry is not advisable, but is common in this hobby unfortunately.
 
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steveb

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Would you expect 120g of 7tds water from RO production to burn through 1/2 of 1st DI resin cartridge? That is really my main concern.

I use a booster pump. Right now my pressure is at 70psi in front of the RO units.
 
Buckeye Hydro

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No, I wouldn't. Number of things may be going on that would cause this. Feel free to give us a call if you'd like to discuss.

Emily
 
RR-MAN

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steveb said:
Would you expect 120g of 7tds water from RO production to burn through 1/2 of 1st DI resin cartridge? That is really my main concern.

I use a booster pump. Right now my pressure is at 70psi in front of the RO units.
Click to expand...

What’s your incoming water tds?

Did you pack the di or bough the pre-packed?

We have nasty water and I don’t even burn that much DI.

Incoming tds 408-416
After ro 15
After di 0
 
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steveb

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I have not measured incoming tds but post RO it is 7-8ppm.

I pack my own resin.




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steveb

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I plan on testing incoming tds when I get back in town. Probably going to adjust pressure up to 85psi as well.


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Buckeye Hydro

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Steve-I don’t recommend exposing the pre-filter housings to 85 psi. Are you talking about turning a booster pump pressure up after those housings?
 
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