MYK LATICRETE L 254 GREY 20KG is a special concrete for use on basement floors and walls. It is available in 20kg bags, and is mixed by adding a cement powder, sand, water and a special additive. This mixture can be mixed by hand, using a shovel, or using a machine. It is stronger than standard concrete, and is also more permeable, meaning it allows water to move through the concrete more easily.