56 FEET? What is it, 5 stories tall??

Dang, that's up there! I know some people put a copper or zinc strip at the top of a roof to keep algae from growing on the roof. I wonder if spraying some of those copper based cleaners would work for a longer time than bleach?

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).