It's Sunday and the Brat Factor is on TV so time for a bit of gentle surfing, and came across this gem of a site
http://www.naturalhomeproducts.com/faqs.htmlFirst, putting stain repellent on a wool carpet is like giving an umbrella to a duck. Wool naturally resists stains (and water) better than anything man-made. Second, stain-repellent contains formaldehyde, a potent toxin. 3M have stopped making their stain repellent (Scotch guard) for an undisclosed reason He's not a fan of non wool carpets either!
Recycled carpet is made with polyester fiber from plastic bottles. Polyester stains easily and wears poorly. To make such a material into a carpet requires the addition of a variety of chemicals. After 5-7 years on your floor the ‘ecological’ carpet goes back to the landfill --so those plastic bottles end up as waste anyway, but with even more chemicals added.