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ESPOMA Sulphate of Potash

	Has anyone used ESPOMA brand Sulphate of Potash as a 
	source of K? I found some at the local garden center 
	5lb bag for $3.99. I've been using K2SO4 from a 
	hygroponics supply in the past but since I do 50% water 
	changes weekly I go through a lot of K.
	The K2SO4 from hygoponics was a white crystals. I was
	expecting the Sulphate of Potash to be similar but I
	was mistaken. It looks like pink/brown granules with
	small-gravel sized specks of what I THINK is sulphur.
	Is this safe to use in my tanks? Has anyone used
	Espoma brand Sulphate of Potash?
	BTW - No chemical analysis in  the MSDS on Espoma's website. 
	They claim its not required.

	Any help would be appreciated.


	Ghazanfar Ghori