Wouldn't it better to go with fewer 1/8 holes. It seems to me that even with the prefilter 1/16 holes are bound to get plugged. I've never used anything less that 1/4 where water flow was concerned but then again you guys are moving water with air so the volumes are small. I'd still go with 1/8, 1/4 if you don't mind the gutter completely draining.
Cheers, Chris
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