Dont beleive everything you read in marketing literature. If that were the case, then salt free softeners would work better than traditional salt systems if I believed the marketing from a particular bird named unit that actually claims it makes "soft water" without salt.
The Drain line Flow Control DLFC limits the water flow to the drain and is set at the factory. it can be replaced in the feild easily to meet the exact water conditions. Typically, the standard setting is adequate unless you have unusually cold or warm water. The fast rinse and backwash are both limited by this device. The Brine Line Flow control regulates the refill but not the brine draw or slow rinse. The brine draw and slow rinse is limited by the injector. Since the flow is slower than the DLFC, the DLFC does nothing to regulate the brine and slow rinse cycle.
Hope this helps.
LOL, had to edit this. I noticed one of the ads on this site is by the company I am commenting on.