dry fert question

[Berne <hugh at kb5kjn_karco.org>]

ok. i just went out and stocked up on chems for dry dosing/pmdd type 
stuff.  I ordered kno2, k2so4, and kh2po4.
Upon getting home, and giving closer looks to what i got, aparemtly what 
was given to me as my k2so4 is actually Sulphate of Potash.  The bag lists 
the contents follows
42% K
50% k2o
18% S
46% so3

It claims to be completely water soluble chemicals.  Any thoughts on this 
mix? is it usable as my K source? or should i go back and kick some butt 
for them giving me the wrong stuff?

thanks in advance folks.

-Berne Kairunas




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