RO storage in keg?

[mashdar]

For the first time, I bought some water from the (new) Primo RO water dispensers at the grocery. I filled a 304SS keg and two PET carboys.

Upon getting home, I remembered that RO water is a fairly aggressive solvent. I'm windering if I need to get it out of that keg.

1. Any reason to worry?
2. I threw in 0.25g/gal gypsum the add some ions. Still an issue?
3. The primo machine has a post-RO filter. I can't imagine what this would be other than a remineralization filter. Maybe this makes it a non-issue?

I have some CaCO3 sitting around from the stone ages, but I'm not jumping to throw it in...

Any thoughts/musings/data welcome.

 

[day_trippr]

Many RO systems (mine included) with bladder tanks provide a "taste and odor" charcoal filter at their output.
Yes, RO can cause issues with some metals, but I don't think 304SS is a problem...

Cheers!

 

[mac_1103]

I can't imagine what this would be other than a remineralization filter.

I think it's just a carbon filter. Would a TDS meter tell you if the water was re-mineralized?

 

[day_trippr]

Would a TDS meter tell you if the water was re-mineralized?

If one tested the membrane output directly vs the system output it should reveal any post-membrane mineral additions...

Cheers!

 

[Broken Crow]

For the first time, I bought some water from the (new) Primo RO water dispensers at the grocery. I filled a 304SS keg and two PET carboys.

Upon getting home, I remembered that RO water is a fairly aggressive solvent. I'm windering if I need to get it out of that keg.

1. Any reason to worry?
2. I threw in 0.25g/gal gypsum the add some ions. Still an issue?
3. The primo machine has a post-RO filter. I can't imagine what this would be other than a remineralization filter. Maybe this makes it a non-issue?

I have some CaCO3 sitting around from the stone ages, but I'm not jumping to throw it in...

Any thoughts/musings/data welcome.

Thanks for bringing this up... I've been considering buying RO in bulk myself and intending to use valveless sankes to store it.

 

[mashdar]

Thanks for bringing this up... I've been considering buying RO in bulk myself and intending to use valveless sankes to store it.

I feel like a small amount (0.1g/gal?) CaCO3 would make it much less corrosive, but it would complicate water calcs due to poor solubility.

But I may be overestimating the threat. I'd hate to get a pinhole on a weld or something.

 

[mashdar]

I think it's just a carbon filter. Would a TDS meter tell you if the water was re-mineralized?

TDS meter is on the christmas list!

 

[mac_1103]

TDS meter is on the christmas list!

But are you on the nice list, or the other one? A TDS meter doesn't cost much more than a lump of coal though, so maybe it really doesn't matter.

 

[Buckeye_Hydro]

Handhelds: https://www.buckeyehydro.com/handheld-meters/

Inline monitors: https://www.buckeyehydro.com/in-line-1/

Russ

 

[JohnDBrewer]

Russ

What do you guys who sell these systems have to say about the corrosive effect? Is stainless ok? How long does it take? Thanks

 

[Buckeye_Hydro]

What do you guys who sell these systems have to say about the corrosive effect? Is stainless ok? How long does it take? Thanks

SS should be OK. Contact with any other metal is not advised.

 

[jwa120]

I've been making seltzer in a keg with RO water for years. I never had an issue.

 

[JohnDBrewer]

SS should be OK. Contact with any other metal is not advised.

Any chance you guys could do some legitimate research for us?

 

[day_trippr]

I think the existing body of work testing austenitic ss alloys against distilled and/or deionized water should provide plenty of insight. There's certainly a ton of articles extant.

For example: https://www.parrinst.com/wp-content...1/07/Parr_Stainless-Steels-Corrosion-Info.pdf

Executive summary: in a filled and sealed keg RO water is unlikely to cause any damage...

Cheers!