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shaywood

GFO Impact on pH

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Posted (edited)

Just replaced my GFO and noticed my pH drope from 8.07 to 8.0.  Is this normal?

 

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Edited by shaywood

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It can in fact be common if you used to much GFO and stripped a ton of P04 from the water column to quickly. See this post here, they describe it in detail.

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I’ve noticed the same thing. If I remember right, the iron acts as a nucleation point for calcium carbonate precipitation. You would also see a drop in Ca and Alk.

I also had carbonate build up on everything in my sump when I was running GFO, also my substrate was clumping.

This is why I don’t like running GFO, it’s real easy to run too much and get your parameters swinging. Best to address why you have a nutrient problem rather than using a bandaid (GFO).

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3 hours ago, xmas_one said:

I’ve noticed the same thing. If I remember right, the iron acts as a nucleation point for calcium carbonate precipitation. You would also see a drop in Ca and Alk.

I also had carbonate build up on everything in my sump when I was running GFO, also my substrate was clumping.

This is why I don’t like running GFO, it’s real easy to run too much and get your parameters swinging. Best to address why you have a nutrient problem rather than using a bandaid (GFO).

Good info - I have heard people mentioning having issues when running GFO but hadn’t seen it laid out in this way. 

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