Conventional Flowable fill or CFF is a low strength (CLSM) flowable fill that is self- leveling, self-compacting alternative to compacted backfill that is delivered to site by volumetric mixer trucks.  This product has the same characteristics as the RSFF but with set times of 24 to 36 hours. This product is used for applications that do not require a rapid set material, but if disturbed can impede set time.