Purigen for Planted tank? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 04-02-2019, 09:30 PM Thread Starter
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Question Purigen for Planted tank?

It claims to control ammonia/nitrite/nitrate.
But plants need Nitrate...
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post #2 of 4 (permalink) Old 04-03-2019, 01:07 AM
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I only use it when adding new fish/bioload to a tank to reduce the chance of an algae bloom . Not sure if it helps or not but I have some left over from removing tannins from a display tank so why not use it up. Never had any problems to think it's not working but I wouldn't use it all the time. Maybe in an african cichlid tank with fish only but it's just not needed in a planted setup.
I use a magnum in tank filter when I do need to use purigen/carbon for a short time.

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post #3 of 4 (permalink) Old 04-03-2019, 01:37 AM
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Originally Posted by damgyeah View Post
It claims to control ammonia/nitrite/nitrate.
But plants need Nitrate...
Purigen controls the three products you mention by removal of the organics that breakdown into NH3/NH4 that the BB further breakdown into nitrite and nitrate. In fact, Purigen is excellent at removing these nitrogenous organics (not P, though). So, in this way it prevents the formation of NO3. However, it does NOT remove NO3 that is already there. This means that you can dose NO3, while using Purigen, and the Purigen will not touch it.

Be aware, though, that many of us believe that plants prefer NH4 (created at pH levels mainly below 7.0) to NO3 and, therefore, want the organics that Purigen would remove. However, you could deal with this by finding a quantity of Purigen to use in your tank that would result in allowing only a certain amount of NO3 to pass through, thereby assuring that some of the NH4 is available to the plants.
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post #4 of 4 (permalink) Old 04-03-2019, 01:53 AM
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From Seachem's website:
"Purigen controls ammonia, nitrites and nitrates by removing nitrogenous organic waste that would otherwise release these harmful compounds. Purigenís impact on trace elements is minimal. It significantly raises redox. It polishes water to unparalleled clarity."

It doesn't directly remove nitrates, rather it removes organics that could possibly cause nitrates when they break down. I use it 100% of the time in a fluidized reactor inside the sump for its organic waste removal and it's polishing water capabilities. Two very important aspects to me, I don't rely on it but it creates a buffer when away from the tank for long periods. It's on a monthly recharge schedule and have 2 batches that get swapped out. Note it does remove some traces (Seachem states minimal) and I haven't seen any information that explores that any further.

Do you need it? Definitely not, I do continue to use it though and havn't seen any negative effects on my tank.

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