It lasted nearly a month for me first time round, the second time I bunged a bag of purigen in my filter and it has been crystal clear ever since.
Well worth the money mate.
I noticed the same thing - got up the first morning and I could see the water was yellow from across the room.
I put the bag of carbon that came with my Tetra filter (which I hadn't planned on using) in the filter, that cleared it up too. I haven't tried purigen yet - hopefully by the time my carbon's exhausted the yellow won't be such a problem.
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