Ylis, that looks like a great tub for mixing and storing your mixes in. When I buy bricks of coco coir like that, I cut off a portion and soak just a small part of it, I never have use for more than 1/4 of the brick at a time if even that. Any garden tool that has teeth can cut through the bricks.
And that cement tub looks good for mixing too, Tommy. I might pick one up for this summer if I try doing any mixing.