I just came across your post, as I too am trying to figure this whole Phosphat-E Brightwell product out. I have been using NoPox for over a year now it has done great at keeping my nitrates at a low level but hasn't done anything for my phosphates. Perhaps it has and maybe if I wasn't using NoPox my phos would be much higher. Currently with my Hanna tester my phos comes in at .81 and when I mailed my water sample to Triton they show it at .82 and claim it's at a high critical level. Although everything in my tank appears to be rocking along fine I felt I must follow the rules before anything begins to happen.
So now I'm starting to work with this Phos-E product. As others have noted about dosing too fast I decided to put mine on a dosing pump and dose very slowly. I have the Red Sea 525XL so I have a guesstimate of 115 to 120 gallons after taking rocks, sand and equipment into account. I dosed .5 ml a day for a week, nothing changed. So I then bumped it up to 1 ml a day for week 2, still no change. I could obviously continue on with small weekly increases and see how it goes at this point but decided to start researching to see what others have done. I also emailed Brightwell Aquatics almost 2 weeks ago and they have still yet to respond.
With all that said, I'm curious how your Phosphat-E journey is going? Lowering phosphate successfully? Still doing small daily doses? Are you going to continue on this same route? My hope is I can get my phos dialed in where I need it to be and then keep Phos-E going on a low daily dose via a pump so it can keep my numbers steady and in the right place, just as NoPox has done very successfully with my nitrate level.
I have gone the GFO route before but I did not like the up and down cycling, not to mention the ongoing hassles with changing out my reactor. I only found 1 spot for the reactor and it was a PITA to service.
Any updates you can share will be greatly appreciated.