castiron
New Member
Long time reader, first time poster.
I have a few more questions for Squidd and others after studying silentshaw's thread.
1. I'm setting up a predrilled 150 that has two overflows with 1.75" holes for overflow bulkheads. Bulkhead: 1.75-OD 1.125 ID threaded. Once I add a fitting I figure the ID will be around 1" or less. Is this what you refer to as a 1" overflow at a 500GPH max? I was hoping to shoot for 10x turnover (1500 GPH).
2. In answering the questions on how far down the tank will drain, no one ever took the return line into account. It appears that not many of you pros use check valves. Without one, wouldn't the tank drain down to the return line due to the siphon effect once the power went out?
3. If that is so, are standpipes even needed on built-in overflows? My over flow is 4.5x8x28 high. That would seems like a lot of dead water volume to me.
4. Did I read once that the rubber of the bulkhead should be away from the water?
I know that's a lot of questions, but I NEED to know.
I have a few more questions for Squidd and others after studying silentshaw's thread.
1. I'm setting up a predrilled 150 that has two overflows with 1.75" holes for overflow bulkheads. Bulkhead: 1.75-OD 1.125 ID threaded. Once I add a fitting I figure the ID will be around 1" or less. Is this what you refer to as a 1" overflow at a 500GPH max? I was hoping to shoot for 10x turnover (1500 GPH).
2. In answering the questions on how far down the tank will drain, no one ever took the return line into account. It appears that not many of you pros use check valves. Without one, wouldn't the tank drain down to the return line due to the siphon effect once the power went out?
3. If that is so, are standpipes even needed on built-in overflows? My over flow is 4.5x8x28 high. That would seems like a lot of dead water volume to me.
4. Did I read once that the rubber of the bulkhead should be away from the water?
I know that's a lot of questions, but I NEED to know.