We bought grass less than 2 years ago, it was professionally installed by a landscape gardener. The grass is still under warranty and i contacted them as its started to turn balck in places. Their initial response it was due to our dog 'bleaching' it. Our dog doesnt uae the area thats turned black, and not sure how bleaching turns it black. Their second response was that it was an environmental or installation issue and offer a 15% discount for new grass. Not aure how they can tell this from photos as they havent even bothered to inspect it. Absolute waste of time. I did leave a review on their websire but they chose not to publish it!