Basic slag

Does anyone use this?

If so what do you think of it?

it seems very cheap for what it is, they have it in our lotty shop for £3.50 for a fair sized bag.

Just in case there is any confusion  the 'basic' refers to the fact that it is high in calcium and therefore quite alkaline, and the 'slag' is a general term for the waste materials which are a by-product of smelting (usually steel.)

Its precise composition varies widely - for that reason it's not easy to say what it's best used for these days, but it's probably best regarded as a source of lime rather than anything else.

It is if it's a really, really big bag