Online is usually much better pricing but supporting lfs
I haven't used it yet, but was thinking of doing it. I like what was previously said binds or attaches dissolved organics. With perfect water clarity who wouldn't be able to appreciate that.
Looks like I will be getting some of this for my next filter clean out.
I have heard to read and follow all instructions for recharging it and rinsing enough. Read bad story about someone who didn't rinse out the bleach enough.