I have set one 2.5 foot section as the down spout from my lower fish IBC to my plant bed IBC. The other 2.5 foot section, plus remainder is at the end of my pump, back into my upper fish IBC. Both are is mostly full sun. I'm on day two or three, and no alge yet, still very clear on the sides. The walls are 1/8th inch thick, and perhaps too thick for enough UV to pass and help the alge. But I've also noticed brown alge build up in the normal PVC so... Ill keep you updated!