When to change DI resin out?

[MarsReefer]

I’m working on filling my tank for the first time and have a question about when to change out the DI resin of my RODI system.

Ive made 100 gallons of water so far and the resin has completely changed color from blue to brown. However it is still reading 0 tds after the resin. Is it still ok to keep using as long as it’s reading 0 tds or should I swap based on color?

it reads 6 ppm before the DI and 0 after so it’s still doing something at least.

 

[Spare time]

As long as the meter doesn't need to be recalibrate, it should be fine until you get 1 going out. Also, 100 gallons seems too little.

 

[Woodyman]

As long as the meter doesn't need to be recalibrate, it should be fine until you get 1 going out. Also, 100 gallons seems too little.

If it really is toast after 100 it would be highly recommended to get at least a second mixed bed, or better yet a 3 bed system.

Is this a new unit or used, if used I'd verify the calibration, still wouldn't hurt on a new unit.

Depending on the brand/mix of DI and how it was packed you will still have a little usable life left if it appears all the color has changed.

 

[Woodyman]

If it really is toast after 100 it would be highly recommended to get at least a second mixed bed, or better yet a 3 bed system.

Is this a new unit or used, if used I'd verify the calibration, still wouldn't hurt on a new unit.

Depending on the brand/mix of DI and how it was packed you will still have a little usable life left if it appears all the color has changed.

Another thing if it is only lasting for ~100 gallons. Where is your water sourced from?

If it's a well you very well may have high CO2 levels in your well water, in which gas separate beds or allowing the water to off gas will be a must unless you want to continue to blow through resin.

 

[MarsReefer]

Yeah I have well water that has a stupid amount of both calcium and CO2 in it. My waters pH raises almost 2 points when left to out gas. I unfortunately don’t have any more room for storage containers to outgas.

Would an extra two stages of separate DI before the mixed bed be worth it? Or just a second mixed bed?

 

[KStatefan]

Yeah I have well water that has a stupid amount of both calcium and CO2 in it. My waters pH raises almost 2 points when left to out gas. I unfortunately don’t have any more room for storage containers to outgas.

Would an extra two stages of separate DI before the mixed bed be worth it? Or just a second mixed bed?

seperate cation and anion stages before the mixed bed.

 

[Woodyman]

seperate cation and anion stages before the mixed bed.

Was about to tag you for the well water!!

 

[MarsReefer]

seperate cation and anion stages before the mixed bed.

Will the stage catching the CO2 still expire after 100 gallons, or to separate beds last longer? It just looks like the cost to replace a separate bed is the same as replacing the mixed bed.

 

[Woodyman]

Will the stage catching the CO2 still expire after 100 gallons, or to separate beds last longer? It just looks like the cost to replace a separate bed is the same as replacing the mixed bed.

It will last longer since it's a full canister and not a mixed canister of 50/50

There are some ways to degass while making water you could try.

Start here, @KStatefan will have more input than me about these methods as I don't actively use them.

DIY CO2 Degassing Chamber for RO/DI

Well, I learned the hard way that the water coming out of my well has a high CO2 content. I burned through a pound of DI resin and only got 40 gallons out of it.... To keep this from happening again, I could either buy lots of RO/DI water or remove the CO2 from the RO water before I pass it...

www.reef2reef.com