Purigen to reduce nitrate creep...?

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Purigen to reduce nitrate creep...?

Postby Joe.Lemm » Thu Feb 21, 2013 9:37 am

I have been looking all over for some answers on Purigen, and depending on who you talk to you always get something different. I 'inherited' about 500 ml from my dad and I want to use it in my Oscar tank. It will be there to reduce nitrate creep and keep the water clear, that is all. I do not plan on spacing water changes out further or expect miracles, I just hope to have lower nitrates when it comes time to do a weekly water change.

My Fluval 404 is ready for a cleaning, so now would be a good time to try it. What I plan on doing is a 60-70% water change, document nitrate creep over the next 5 days without purigen, then do the same water change and document nitrate creep with purigen in the system. Not sure if anyoneas kept a log on this with photos of their findings, so I figure I would give it a shot to answer my own questions about purigen.

Does anyone have any suggestions on how to get a good comparison? Or maybe this has been done before and I missed it somewhere?

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Re: Purigen to reduce nitrate creep...?

Postby Kmuda » Thu Feb 21, 2013 10:04 am

I've experimented with Purigen extensively. I never noticed any difference in Nitrate creep with it's use, even when using about 5x the recommended amount. I think Purigen functions about the same as carbon with the exception it is more selective. Regenerated Purigen also can drastically alter pH. I've had it drop my pH to below 5 although it could just as easily crank the pH way up (the bleach soak causes it to be alkaline).

For testing, the best method is to perform a 100% water change (drain 80%, fill halfway, drain back down, fill halfway, drain back down, refill all the way). This will reset nitrates to zero allowing for easy comparison of nitrate creep during the week.
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