Epsom Salts, just a quick double check please

I have what seems to be a Cal/mag def at week 5 flower, which research has told me to add some Epsom Salts.

I have bought: Epsom Salts B.P - Magnesium Sulphate...is this the right stuff??

Also, I'll only be making up a litre, so about 1/4 teaspoon?? In pH adjusted water with no other nutes etc??

I'm pretty sure that i'm on the right track, but wanted to triple check before adding anythng that is a "sulphate"

Thanks in advance

you are on the right track. just mix and feed. remember this mg moves very slowly in plants so it will take any where from a couple of days to a weeks or so to see any real changes......

Thank you. I'll give them a Espsom salt feed now, normal feed in a few days, and re-assess for the wateriing after that.

Much Obliged