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on Test Kits
> I'm just curious if anyone uses the Hagen brand. I
> have not seen anyone mention it. Is it because the
> product is not widely sold outside Canada or is it a
> poor choice for you serious hobbyists?
> I'm currently using their Master Test Kit for
> everything: pH, NH4, NO2, NO3, GH, KH, Ca, Fe, PO4
Yes I'm using Hagen for No3, GH, KH, Ca and Fe but not for PO4!
Hagen's PO4 testkit does not work on KH2PO4 at all :-(
JBL does and it's been reported to me that also Sera's PO4 kit shall work to.