He sure did. Sorry op I didn't read your question very well. :hmm3: Yes I still use gfo.
I don't find this to be a solution to phosphates but rather a way to lower them inexpensively. The amount of gfo it would take to lower high phosphate saturated rock would be crazy expensive. Gfo could be completely used up in 24 hours depending on how high your po4s are.
May not be pertinent to this post butI am in the process off going from gfo to scrubbers. The gfo nearly broke me. The results I am seeing have been amazing.
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