But you guys are assuming he's trying to up his calcium. As far as raising calcium then yes a 2 part works better, but many hobbiests swear by that purple up. Now granted it does raise calcium levels, but that was not the reason the OP added it.
I have never used it, but I am wondering if they have a nice mix of something or other that might actually work.
My tank took 3 months to start showing dots of corraline, and the people who use PU swear they see results in less than a month.
But if the calcium level does stay at 440, then it would be dangerous to add more,