Right on the panel it states less than 30ppm under "recommended pool chemistry", image attached.
In their own manual it says from 30ppm to 50ppm. The Pentair rep I spoke with yesterday firmly told me from 30 to 50, but when I asked her about their own contradicting message printed on the front panel she did not know what to say. She promised to speak with an engineer and call back, but she never did.
This is a very big difference. Less than 30ppm implies that 10 is ok, 20 is ok, above 30 is not ok. From 30 to 50 is a completely different story. Which one is correct?
Edit 7/21/14 I just wanted to give a quick update in case someone else is interested to know which directions to follow: a Pentair rep told me that their manual was revised to reflect the most recent guideline while whatever is still printed on the panel is an outdated info. They changed their requirements from "less than 30" to "from 30 to 50" CYA.