Testing with the Taylor kit, "upstream" from where I add the bleach:

FC: 4
CC: 2.5
pH: >8.0

My pump is currently off, as a large amount of rain will sometimes trip the breaker.

Any thoughts on what would cause a spike in pH? It certainly wasn't that high yesterday. Again, I know that bleach is basic, as is the ammonia that the algae would be producing.