Me thinks the 7 year warranty is just a ploy. Maybe but maybe not they will find an excuse not to honor the warranty. Be thankful if you get 3 years out of one. One Leslie cover I got had a statement that chlorine levels ove 1.5 ppm will void the warranty. Thought it was a misprint...nope. Didn't bother me though...I got my 3 years even at significantly higher chlorine levels. One important thing is to be sure and cover them with a white something when rolled up in the sun. You can get enough infrared heat into the center to melt the things.
Al