What make this lime "fast acting" compared to other lime is the particle size, nothing more, nothing less. This is pellet lime, with tiny particles most likely somewhere in the 200 mesh screen area(i.e., very, very fine powder), held together with a binding agent. It works relatively fast compared to other lime because moisture will break down the binding agent and "release" the fine powdered lime particles into the soil, as opposed to larger 60-100 mesh screen particles which take much longer to break down and bind to soil particles. As far as being able to replace 5 bags of conventional lime, fat chance, calcium of equal CEC is still going to require the same amount be applied, regardless of particle size. In that case, it appears to do the job of 5 bags because there are less of the tiny particles in a bag of "regular lime", so it looks like it is doing a better job with less product. What they don't tell you is the smaller particles leach faster and don't last as long in the soil profile as the larger lime particles, so you end up applying it more often. Still not a bad price for small out of the way plots!