Natural seawater is around 7 dKH
, so your fine being at 7.5 dKH
. The best way to raise your pH is get more fresh air into the system, or if you have a closed top, open it up, or try pointing a powerhead towards the surface to promote better gas exchange. If you live in a colder climate region where the house is closed up for the winter, it's normal for the pH to be a little depressed in the winter due to the increased amount of co2
in the air in the house.
Changing salt won't necessarily bring up your pH and raising alk
may not effect it either. Being your alk
is in a normal range, co2
has the biggest effect on pH.