by Swing Swang » Tue Feb 23, 2016 6:21 am
Look up for local suppliers of PDV salt. I find that if I look for specialist sellers of water softener salt pellets/blocks that they'll order 25kg bags of food grade PDV salt for about £6.00. PDV salt is usually all very finely ground which might not suit every application though. In my case it is the independent bulk pet food/bird food outlet on the industrial estate that sells all types of salt in 25kg bags.
PDV salt is available in 10kg bags from Bookers if you can get an account with them, but is no cheaper than above.
Coarse sea salt is very cheap in continental supermarkets. Less than 15cents a kg in Portugal for example. Always worth bringing a bag or few back, and there's no problem in carrying it as hand luggage ( apart from the weight).