I just checked mine and I am finishing up my bottle and it is the 3000 version. With it I have been doing 5ml in a liter of water. I did a test over several weeks starting out dosing say 24 ml of the diluted mix over a days time per day and tested my phos level. If they increased I just increased my dosing amount. I dose using my dosing pump and pump it directly into the bottom of my skimmer. I am currently dosing about 40ml a day and maintaining .04phos. It seems to be working well at maintaining my phos levels. The new bottle that I have is the 9000 bottle so I will have to change the amount I add to my brew. I will most likely go with about 2ml in a liter of water.
Jeff
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