High Alk in RODI water. Asking for a family member

[14 foot reef]

High Alk in RODI water. Asking for a family member. We have tested with Titration and Hanna Checker. The RODI in my brothers community well water is 20 dKH before adding salt.
Is their a recommended technique of product that can lower the RODI dKH prior to adding salt?
The mixed reef constantly runs 14 dKH.
Thanks in advance for the forums advice. @Randy Holmes-Farley

 

[Randy Holmes-Farley]

Well and tap water can certainly have a lot of alk.

But 0 ppm tds ro/di water won’t.

Either the alk measurement is off or the di is depleted.

That said, lowering alk is new salt water with sodium bisulfate or muriatic acid is a fine plan that many people do for various reasons.

 

[Miami Reef]

If the high alk stems from a depleted DI resin, won’t heavy metals possibly be a concern? Mineral acids won’t solve those potential issues.

 

[14 foot reef]

Thanks Randy, so if the raw fresh RODI from the Well is measuring 20 dkh, then its either testing error, or bad filtration at the RODI unit, either the RO unit or the DI resins ?

Thanks Randy.

 

[Randy Holmes-Farley]

If the high alk stems from a depleted DI resin, won’t heavy metals possibly be a concern? Mineral acids won’t solve those potential issues.

That is true.

 

[Randy Holmes-Farley]

Thanks Randy, so if the raw fresh RODI from the Well is measuring 20 dkh, then its either testing error, or bad filtration at the RODI unit, either the RO unit or the DI resins ?

Thanks Randy.

Yes. 0-1 ppm tds ro/di will always have 0 dKH of alkalinity.

 

[Vinaka_vakalevu]

Thanks Randy, so if the raw fresh RODI from the Well is measuring 20 dkh, then its either testing error, or bad filtration at the RODI unit, either the RO unit or the DI resins ?

Thanks Randy.

id personally be very surprised if there is a whole community RODI system. I can see a community having a filtration system for the well water but I see it as unlikely that is it s full RO/DI system

 

[14 foot reef]

id personally be very surprised if there is a whole community RODI system. I can see a community having a filtration system for the well water but I see it as unlikely that is it s full RO/DI system

Community Well, personal RODI filter system reef at sump room.

 

[14 foot reef]

Yes. 0-1 ppm tds ro/di will always have 0 dKH of alkalinity.

Thanks as always Randy

 

[Vinaka_vakalevu]

Community Well, personal RODI filter system reef at sump room.

Ah yes makes sense, sorry I miss read the first post