pH drifting upwards - is it polyquad?

[Water_man]

I haven't opened yet (Tuesday is the day) and meanwhile I keep FC and circulation using sub pumps at 3000 gph.
Initial numbers:
CYA 8
FC 1
CC < 0.5
0< Ammonia <0.25
Alk 90.

I also added some 60% polyquad. Before I added the alagaecide pH was steady at 7.3 - 7.4, but after that it drifted to 7.7-7.8. Is this a coincidence?
We've also had some rain but rain here is acidic.

 

[dmanb2b]

not sure if it is the poly, but it could be the rain...although your rain water may be on the acidic side, it is a very good source of aeration which could raise your PH.