Can you increase Alk and not PH?

[Peale]

I have a 65g mixed tank. A month ago, I switched from dosing 2 part to using kalk in my ATO. My PH is now high at 8.4, but my Alk is low at 6. Is there a way to increase Alk without increasing my PH? If I use more kalk or add the alk 2 part, they will both raise the PH...

Thanks!

 

[bertoni]

You can dose baking soda, which will lower pH a bit when added.

 

[Peale]

Thanks! I am doing some research now on that.

 

[DopeCantWin]

Thanks! I am doing some research now on that.

Baking Soda is Sodium bicarbonate. Which will lower Ph. When you cook it, it turns into Sodium Corbonate. Which will raise Ph when dosed. Bigger question that comes to my mind is why do you want to lower Ph?

*Misread your first post. Yes Sodium bicarbonate will raise your alkalinity. But at current value of 6, the amount it would take might lower your Ph too much. So do it slowly.