Mark V Posted September 19, 2012 Share Posted September 19, 2012 Which is better? I've heard both sides of the argument and curious to hear what everyone's opinion is Link to comment Share on other sites More sharing options...
Grim Posted September 19, 2012 Share Posted September 19, 2012 DRILLED Link to comment Share on other sites More sharing options...
(Bio)³ Posted September 19, 2012 Share Posted September 19, 2012 Drilled Link to comment Share on other sites More sharing options...
subsea Posted September 19, 2012 Share Posted September 19, 2012 All overflows can get plugged up. The lowly snail can plug up both drilled and HOB overflows. The question and the answer is relative. I have used both over the years and they both work. However as you already know, there are more things to fail with HOB overflows. Whichever technique is used, design water levels and positioning of pumps so that return pump will suck air before overflowing DT. Link to comment Share on other sites More sharing options...
(Bio)³ Posted September 19, 2012 Share Posted September 19, 2012 Drill it with 1 primary drain, one secondary, and one emergency. It helps prevent a lot but not all potential problems. Link to comment Share on other sites More sharing options...
jestep Posted September 19, 2012 Share Posted September 19, 2012 Drill it with 1 primary drain, one secondary, and one emergency. It helps prevent a lot but not all potential problems. +1. There's several designs that allow for this and are very quite. If you don't have room for 3, I would design the system for a primary drain, and a larger emergency drain. That way if the primary gets blocked or slows down, there's no chance your secondary wont be able to keep up. Link to comment Share on other sites More sharing options...
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