PH Drops when Red Sea 'Coral Pro' Salt is added

[merfury1989]

Hi, I want to know why my PH drops when I add salt.

My RODI water gives me 8.6PH on its own.
But when I add Red Sea Coral pro Salt at 35ppm, my PH reads at 7.6-7.7

Any advice?

 

[lapin]

That's a new one . Here's what they say.
Red Sea Coral Pro Salt will produce stable seawater with a pH of 8.2 – 8.5.

 

[killer2001]

RODI should give pH of 7.0 iirc

 

[ColoredRock]

Hi, I want to know why my PH drops when I add salt.

My RODI water gives me 8.6PH on its own.
But when I add Red Sea Coral pro Salt at 35ppm, my PH reads at 7.6-7.7

Any advice?

ph high on RODI water?

Hi all, I was making some freshwater to dip a fish in and i checked the PH on my RODI water. I have never done this before until now and I am getting a reading of 8.6. My tap water is 7.5. I also have 160 gallons of saltwater mixed at 1.024 and it is reading 8.2 which i expected to be higher...

www.reef2reef.com

 

[Randy Holmes-Farley Verified Community Expert]

You do not have tools suitable to accurately measure the pH of totally pure water, and regardless of what you measure, if it is 0-1 ppm tds, it is not impacting the pH of seawater made from it.

Once you aerate a salt mix in water, the pH us determined only by the alkalinity and the CO2 level in the air.

 

[merfury1989]

You do not have tools suitable to accurately measure the pH of totally pure water, and regardless of what you measure, if it is 0-1 ppm tds, it is not impacting the pH of seawater made from it.

Once you aerate a salt mix in water, the pH us determined only by the alkalinity and the CO2 level in the air.

Thanks for summarizing like that, it makes sense now.