no oxegen = phosphate

[johnny5]

hi i have set up a water chang tank and when i dont have oxegen eg are ston in the tank water terns in to phosphate
and the tank with fish
and with KH water terns in to phosphate

[cichlidboy]

so where does phosphate come from?

[johnny5]

I think it may of been comeing from my bucket
and phosphate is in kh

[Woodsy]

Depends which brand of buffer you are using. A carbonate hardness (KH) buffer should only contain sodium or potassium carbonate, whereas something labelled simply "buffer" may indeed be a phosphate buffer. Then depending on which test kit you are using, this may or may not show up as contributing to your alkalinity. It can be a confusing matter if you take everything into account.