Ohh do tell, I think as long as it’s in a sealed container it’s should be fine but I am aware that it will crystallise if not so you need to rinse out the hose you use to do the refill.Got answer with Google. Thanks.
18 months if kept in optimal condition, ie out of direct sunlight and between -6C and 25C. Looks like I have overstocked, but at £9 per 10 litres it was cheap. I have seen them sold at over £20 per 10 litres.Ohh do tell, I think as long as it’s in a sealed container it’s should be fine but I am aware that it will crystallise if not so you need to rinse out the hose you use to do the refill.
That’s what I have been doing anyway. Seems to work.