The Halos have 3 rows of holes I enlarged the holes in the inside row.... I get an even flow... or even enough.... and get a BADASS pump. the harder and faster the pump pressurises the manifold and halos ( forces all the air out of the lines) the less time there is for the volume to vary between Halos... hope this helps... when my pump kicks on i can hear the manifold rattle, lol its a tell tell that it's working right...
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