The small syphon holes can clog from salt creep or calcium buildup. Personally, I point my return nozzles just above the water line. Unless you are running a high flow through the sump and/or have static return lines, this is the easiest option.
Anti siphon on return line
- Thread starter haninja
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1/16th is too small IMO. I use 1/4 holes on 1" pipe, that works well. I wouldn't go smaller than 1/8" and no matter what size you drill, put it on your list to clean out the hole every month or so... also, the hole can be slightly below the water line if you are religious about reaming it out on a monthly basis to clean out the coraline.
