About 3 months ago, I replaced the ORP sensor on my PoolPilot. About 2 months ago, I put Borax into my pool as a buffer. Right after doing that, my ORP sensor says "right on" number-wise, but a chlorine test shows no CL in the pool. I bumped up the ORP target on the system, and it makes more CL now (still pretty low), but over the last 2 months, I have been getting algae "spots" on the pool in different areas. These are not going away, but multiplying.

My main question is - does adding Borax throw off the ORP sensor? I know that it is an algaecide itself, but not sure why the AutoPilot is having issues after the add. Am I OK to just bump up the ORP target on the system?


Thanks for the help!

-randy