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Hi Julien

The aging of the pipes is indeed likely to be due to UV light. You could try specifying UV stabilisied pipes (a pigment is added to feedstock that absorbs UV) or a different pipe material. Depending on costs you may have to accept that there will be a limited design life to plastic pipes in this application. In the past I have used sun shades for plastic tanks, but this is unlikely to feasible or cost effective for guttering. The other alternative would be to make gutters from a more durable material, e.g corrugated sheets or split bamboo.

Regards

John