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Need more than one roll...several hundred metres worth probably, 13mm would be better. Exchanging heat from where?

Don't have a pool but since I'm a bit of a ghetto/DIY type of guy I've always figured I would just get a whole heap of 13mm polypipe and fittings and rig something up myself. Would just need to make sure there is enough polypipe in parallel so as not to create too much pressure. Heaps of...