Approaching total coral wipe-out

[lastlight]

Really sorry to hear things haven't improved Adam. Can't imagine loss on that scale.

Originally Posted by hfp75

I sympathize for your situation!!

I tried to save few bucks and used HC-GFO and with a Hanna tester I was able to prove that the same levels of PO4 that went in to that reactor also came out!!! I have switched back to Rowa and we are back on track with total success!!

Sometimes the name brands cost more but they seem to be predictable....

HC-GFO from where?

I doubt properly working gfo knocks the levels down noticeably with one pass. I always thought it would take a small amount out (too small a change to detect) but it's the continual running of water through it that brings the overall level down in a measurable manner over time?