No else asked so I will.
What time of day are you checking your pH?
The pH tested just before lights on will be the lowest reading for the day. The test done just before lights off will be the highest reading for the day. Test the pH at the same time every day for comparison.
I use the baked baking soda (1 hour + at 350 +) as an additive, and yes it is designed to raise Alk
and also raises pH temporarily. Now that my Alk
is stable my pH ranges from 8.12 - 8.25 (I have a pH monitor and check before I leave for work and just after lights out). I have turned off my Alk
drip for now.
water has ZERO buffereing capacity and probably a low pH until it has mixed with some fresh air for a while. RODI
should then be mixed with salt miz to a SG
of ~1.025. Let that mix overnite with a power head and then test the pH and Alk
of the new sw
You may need to buffer your salt before adding it to the tank.
Which salt mix are you using?