The half phase in the TA test is normal from drop to drop. provided you are wiping the dropper tip between each drop?
thats a good bit of aeration and will continue to raise pH A quick remedy may be removing the eyeball they thread out so that you don't force water to break the surface tension in the spa but maintain flow
thats a good bit of aeration and will continue to raise pH A quick remedy may be removing the eyeball they thread out so that you don't force water to break the surface tension in the spa but maintain flow