the product you mean?
yes that but mine was API
I added drops as directed on the bottle, added more floss in the filter and as hours passed water went clearer and clearer. Later that day (say 10hrs later) I did a 50% water change and replaced the filter floss. I didnt rinse and reuse since I wanted all the green algae spores out of my tank.
Did the same thing the following day or the day after and what do you know it cleared up well.
Whats your current filtration on your tank??
Did you disturb the gravel recently??
Do you have root tabs in your gravel??
Heres some photos of my tank 5 months ago
With green water:
After a 90% water change..Did nothing but make the water cloudy and then green again in the next few days..
And after accu-clear and water change and adding more filtration..
Not sure if it will work for everyone.. But heck it saved me from spending $$ on a uv sterilizer.