Rodi Question

[Poseidon]

So I've bascily had my RO unit setup and run for 1 week straight.
It produced about 250 ish gallons of water.

The entire DI canister has changed colour and the micron is a very dark brown.

Would the DI go south that fast?

It was a 50g per day membrane. It did around 35-40g per day according to my shoddy math.

 

[Nighthawk26]

Sounds about right. Really depends on the filters being used and the water coming in. Not sure on your city, but Chloramines will tear through DI 10 times faster than chlorine. Are you monitoring what the TDS is going INTO the DI section?

 

[Poseidon]

I Have no idea what my town uses. And no not monitoring di in the unit. Just finished product which is 0-2 tds


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[Salty Cracker]

How old is the membrane?

Backflushing the membrane will extend life considerably.

I tend to ignore the colour of the DI resin. I go by the meters. I have ~120 TDS going in, and replace it if anything except 0TDS comes out, but I find I can do ~400 gallons on a set of DI. Can you test the output before the DI? If it's crazy high, then DI will fill up. Things to check anyway.

 

[Pistol]

I Have no idea what my town uses. And no not monitoring di in the unit. Just finished product which is 0-2 tds


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Otterville uses sodium hypochlorite for disinfection.

 

[Poseidon]

How old is the membrane?

Backflushing the membrane will extend life considerably.

I tend to ignore the colour of the DI resin. I go by the meters. I have ~120 TDS going in, and replace it if anything except 0TDS comes out, but I find I can do ~400 gallons on a set of DI. Can you test the output before the DI? If it's crazy high, then DI will fill up. Things to check anyway.

everything brand new,

5 micron, carbon block, 55gpd membrane, di resin


sodium hypochlorite sounds scary... using RODI totally elminates that right?
how do you know otterville uses that stuff?

 

[Pipes]

Are you running a water softener before the RO? If you run hard water through the RO, the TDS will be higher, and the membrane will exhaust sooner. Calcium and Magnesium (Lime/hard water) will kill a membrane.

 

[Poseidon]

Are you running a water softener before the RO? If you run hard water through the RO, the TDS will be higher, and the membrane will exhaust sooner. Calcium and Magnesium (Lime/hard water) will kill a membrane.

yup softener before the rodi

 

[Nighthawk26]

Aside from the mentioned back flushing, try to limit the amount of short runs you put it through (TDS creep). If you don't ever need to make THAT much water, you could put a splitter valve on the RO output before the DI and flush the first few minutes of water before putting it through the DI. Knowing what the TDS going INTO the DI will be a huge help to things though.

 

[Poseidon]

Aside from the mentioned back flushing, try to limit the amount of short runs you put it through (TDS creep). If you don't ever need to make THAT much water, you could put a splitter valve on the RO output before the DI and flush the first few minutes of water before putting it through the DI. Knowing what the TDS going INTO the DI will be a huge help to things though.

what would you classify as a short run? 10-20gallons?

 

[Nighthawk26]

It's not so much the runs, it's more if there is a lot of on and off without longer runs in between. 10-20 is fine. Really though, get an inline meter so you can monitor that, and maybe put the other on the input. As someone else mentioned, also don't pay attention to the colour. In fact, when you change that resin, don't buy color anymore. It doesn't last as long, and even then there is often life left after it changes anyways.

 

[Poseidon]

good call.
i will do that for the next resin change.

Ill be good for now though, tanks full and up and running, will have enough for the first couple water changes and then go from there.

Thanks guys!

 

[Pistol]

everything brand new,

5 micron, carbon block, 55gpd membrane, di resin


sodium hypochlorite sounds scary... using RODI totally elminates that right?
how do you know otterville uses that stuff?

sodium hypochlorite is chlorine, I googled otterville water disinfection.

 

[Poseidon]

Haha I see
The power of Google


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