Do not use Purigen with "Aquasafe Plus".
I have NO idea what the actual issue is, but for some reason when using Purigen with aquasafe plus as the dechrloinator I had crazy results it threw the water out of whack and cloudiness etc.
I now use Prime with Purigen but I only use my Purigen when first adding new driftwood etc to help with the tannin.
There is no better product on the market for removing tannin issues, my tank was dark yellow and the next day crystal clear. But I would not keep Purigen in other than sporadically for fixing certain conditions in the tank, it removes a lot of the food source for plants and bacteria.