Hi @Dmitri I hope the GFO is starting to help your elevated PO4. Here's a couple articles to show you what else GFO does to water chemistry. I agree it is useful and I'm not saying I won't ever use it, I most certainly will when I face the same issue. But I'll do more frequent water changes, especially after I take it off line. During use, dosing some trace may be beneficial too.
I'm curious if you've noticed any drop in pH since you started it, as well as a higher Alk demand?
I'm curious if you've noticed any drop in pH since you started it, as well as a higher Alk demand?
Aquarium Chemistry: Effects of GFO (Granular Ferric Oxide) on ‘Trace’ Metals Concentrations in Artificial Seawater
Granular Ferric Oxide (GFO) is popular among reef hobbyists as a means to decrease phosphate levels and subsequently algal growth in their tanks. GFO, however, can also affect other ions and compound levels as well. In this article, Dana investigates the effect that GFO has on our tanks outside...
reefs.com
What is GFO? - Simplicity Aquatics
Aquarium GFO, or Granular Ferric Oxide, is a popular chemical filtration media used in fish tanks. Learn more about it in this blog article.
www.simplicityaquatics.com