You use water kefir grains to fermented sugared water which is good for your gut/microbiome. I mix 50g of grains with 1 litres of water. The grains multiply during fermentation so depending on demand I may have more to offer in future.
I can't enforce this but I would encourage whoever gets these to offer some of the excess grains they get after fermentation in Freegle so others can benefit.
50g of Water kefir grains. RG54AB (Woodley RG5)
This offer has been gifted to someone and is no longer available.