Ya and now that I saw Esteban's comment about how Randy Holmes Farly thinks it doesn't make a significant difference rinsing or not in terms of the p04 introduced I won't be rinsing my food ever again. Ever. Yeah I said ever.
I think its your giant man made rock scape leaching the po4 but that is just a guess.
It was Mike who found the thread, I do love you Bean, mostly cause you take a good pounding.
I also agree with Cody, it's your Rock. Try testing at night. Scott Pciscott was telling me how his rock would leach out at daytime and at night would suck it all up again. Confirmed through testing.
Funny thing speaking of rock, only my man made crap has patches of that nasty algae I can't shake, FTMFL!