Followed instructions to the letter. Ended up with a near killed lawn. Paving slabs also horribly stained. Advise you he very careful using this product. It may be good and It maybe I caught a dry spell after it's application - hence damage to lawn. I've also just spent £12 on citric acid, which, apparently, will remove the iron sulphate stains (bright orange) from what were my beautiful sandstone paving slabs! I wish I'd never used this stuff ... would have preferred a mossy lawn!