Originally Posted by roka64
Purigen will not absorb phosphates. It does absorb ammonia, nitrItes and nitrAtes. You can also recharge it every 2-4 months, depending on your bioload.
And actually, Purigen doesn't even claim to absorb ammonia/nitrites/nitrates. In other words, if you put it in a tank full of nitrates, it won't remove them. It definitely has no effect on phosphates.
What Seachem does claim though is that it removes the "precursors" to ammonia, nitrites, and nitrates. So if you use it continuously in your tank, like carbon, it will keep your nitrate levels low because it will absorb stuff before it can get to that point. It obviously doesn't remove everything because then your bacteria would starve.
I've used Purigen for about a year now and am happy with it. But it won't remove phosphates or existing nitrates.
Agree with cmor... get your own test kits and start doing your own tests so you can understand for yourself your water quality, and then decide what to do about it. In this hobby, if you ask three different people the same question, you'll probably get four different answers! And that does nothing but confuse the heck out of you!