CoolTube is a white, soft poly hose made for hydroponic use. It is 6mm thick and comes in 30 meter rolls - cut as required. It will cool your nutrient by up to 10% over black poly pipe and increase dissolved oxygen by 20%. It has a dual black layer on the inside and a white outer construction.
1 roll of 6mm thick white soft poly hose and is 30 meters in length