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I have found if it is coming from the rock, I discard the rock.
Had this a few years ago when adding a live rock. Could never lower phosphate.
That rock also had an unusual amount of GHA. Took the rock out, lowered phosphate with LC 1 ppm per day and in two weeks the 15ppm was zero.
Phosphate has never returned in over a year.
Now for the rock....dried it out completely for months.....did an acid wash.....rinsed.....dried it out again....put it in a bucket and presto....in one week sky high phosphate.
I think that people take their LR back to the LFS when they exit the hobby and the LFS just resells it.....but it may have come from a unmanaged tank....
Now using this new Carbi-Sea dry rock....which is great to add more rock without pests, hitchhikers and phosphate buried in my rock. The stuff is already purpled up dry and stayed that way when added.....love that stuff but not cheap
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