A lot of people have success with N2, I didn't. N2 does say that IF your water gets cloudy, use dichlor instead of MPS.
I used the N2 the first time on this water change and didn't have any luck with a lowered chlorine level. I was running at 3 PPM for 3 weeks without any problems and then decided to lower it to 1.5 PPM. 2 days later without use, I opened up the cover to find cloudy water.
As other's have said, clarifier treats the symptoms and it's not a cure. As they said, shock with chlorine or chlorine/MPS product and see if it clears up; I personally used clarifier just to speed up the process clearing the tub.