ph up...way up...why and what to do

[bosox]

My PH is spiking up fast....why would that happen and what should i do to regain proper parameters?
thanks,
Nia

 

[attml]

What reading is it at? You can slowly add some vinegar to lower PH if it is way out of line but you need to figure out what is causing the spike. Are you dripping kalk?