Salmon Bays CDF, “Bay Flow”, is a more flowable version of Sand Slurry. It is designed to flow into tight locations and areas with smaller voids to be filled. Bay Flow is self-consolidating mix containing cement, which usually has a higher PSF than the surrounding native soils. Used mostly in utility work, during back filling applications, it generally comes right out of the truck and into the ground. CDF can be pumpable with the addition of higher proportions of cement and/or fly ash.