A dedicated plumbing line is recommended for all waterfalls. It requires a 50mm PVC pipe be used for all installations and specifically where the required flow rate exceeds 200 ltr/min or the total pipe length exceeds 20 metres. The waterfall must be installed before any coping or decking is laid.
The AstralPool Waterfall is covered by a limited 12 month warranty against defects in materials and assembly from the date of purchase plus 30 days (to allow for installation). Astral installation guide can be found here.