George Farmer
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http
/www.ahsdirect.co.uk/product/135/77
I've just bought this from my local garden centre. I'm pretty certain it's pure K2SO4 and have sent an e-mail to the manufacturer to confirm.
I wasn't too fussed about dosing extra Potassium but I thought I may as well at this price. You can't really OD anyway so it's worth a try.
I post a confirmation when I get a reply from the maker.

I've just bought this from my local garden centre. I'm pretty certain it's pure K2SO4 and have sent an e-mail to the manufacturer to confirm.
I wasn't too fussed about dosing extra Potassium but I thought I may as well at this price. You can't really OD anyway so it's worth a try.
I post a confirmation when I get a reply from the maker.