I have ordered vibbfri concrete C32/40 Sk 16 for the pool bottom slab. I thought I'd take concrete for my form for the basement stairs at the same time. Do you think it will work or is vibbfri concrete generally too fluid for stair casting? I have built a form without "lids" for the steps.
It will never work, unfortunately 
just use regular concrete all the way through and you can handle both the stairs and the pool.
just use regular concrete all the way through and you can handle both the stairs and the pool.