Hey Chin - not worried about the substrate leaching phosphate? I'd be interested to see what kind of PO4 the reactor is emitting.

Having said that, I haven't tested my reactor output though because ignorance is bliss!!

difference
 

Currently does any CA media guarantee no leaching of phosphate? Last I read is that ALL calcium media leaches phosphates. If there is "no phosphate" media, I'll switch to that media.
But otherwise, I can't personally see the difference between crushed coral brand A and crushed coral brand B or crushed coral brand C.

I am actually in the planning phase of making a closed loop phoshate remover out of a Phosban reactor for the efluent of a calcium reactor.

No but I thought we're using reactor media over just any old coral gravel because that "reactor media" is intended to have fewer phosphates. I dunno if that's just a marketing gimmick though. But that's why I thought you shouldn't throw things like snail shells in your reactor media and so on.

Maybe that's a valid test for comparing various reactor media brands - see what kind of PO4 they emit.

Doesn't Marc basically have a recirc stage for the effluent going through some phosban? Sounds like a decent idea to me anyhow.