So i went to my local hydro store today and got myself plant magic A & B. Got home and gave then a small taster off it and while putting the bottle caps back on i noticed one that part B is for Hard water, like iv only used 35ml of a 1ltr bottle but now its open i cant exchange it. so id like to know if id get away with using it without any serious problems or is it just best to get the soft water version and throw it away. I know the obvious answer is to just buy the soft water version but it seems a bit of a waste.