Hi
One reason why your Ph is drifting around could be due to your low TA. Your TA will give you an idea of how easy (or difficult) it will be to change your Ph. The lower the TA...the easier the Ph will react and change. The higher the Ph...the more difficult your Ph will be to change. Just by raising your TA...you may find that your ph drifting problems are gone.
But let's wait for one of the regulars before you go adding anything to your water
What kind of a pool? Do you have a heater?
happy swimming!
dan
Bookmarks