Dosing Kalk PH Low Alk High

[BanditMan15]

I have a 90 Gal Reef setup running Apex dosing Kalk and that's it. However what is strange is that my PH is low but my Alk is high so if I increase the Kalk it's just going to raise the Alk and my PH is still running 7.6 to 7.8. Anybody have any suggestions?

 

[BanditMan15]

I also have Co2 Canister running with Skimmer.

 

[Jason_MrFrags]

Have you looked at using sodium hydroxide instead of kalk? its not balanced but will give you a ph boost.

 

[BanditMan15]

I found out it was my ph sensor ! ! It was out of calibration Thanks guys