I never heard of swirl away until my tub was about a year old. The first time I used it, it did seem to dislodge a small amount of crud from the plumbing, but nothing to write home about I have no doubt is a good product, but I think its use is a little hyped here. Its cost is reasonable, a bottle gets two uses for most size tubs. My only midly informed opinion is, if your tub is new, you don't need it, it won't hurt, might even help. If your tub is a year old, give it a try. I've thrown more money away on products that do less.