pH Buffer (disodium phosphate) sources

[nd55]

Hello,

I have normal sodium phophate (pH-down).

Does anybody know of a source of disodium phosphate, the other component of the phosphate buffer system?

I don't want to pay $$$ for reagent grade stuff?

Anyone know why it isn't more available?

Nick.

[fishgeek]

try pool supplies they usually have most of these things, including sodium hypochlorite which i think is dechlorinator?