Semaphor parent
I get the brand Lotao, but they are German (also available in UK IIRC). Our drug store DM also has a house brand of it. I assumed that if there are 2, there are probably more elsewhere ;)
Yeah that's the one, I have it on subscription, 1kg/2 months (about 3kg of finished product)
But considering the simplicity of the product, I assume any brand will be very similar.