Difference between 1.5" and 2" drain in overflow

[shrimpchips]

According to here, the difference in gravity flow between a 1.5" drain (2100gph) and 2" (3300gph) is 1200gph - fairly substantial. Now, I don't know if those numbers are 100% accurate or not, but even if they're off by 25%, I'd say there's still a significant increase in drainage using the full 2".

[fishytime]

Herbie......

[Chin_Lee]

Originally Posted by fishytime

Herbie......

Once you've had Herbie...... you'll never go back.

[christyf5]

Originally Posted by Chin_Lee

Once you've had Herbie...... you'll never go back.

I'm of the understanding that in order to do a Herbie overflow you need two holes drilled. The overflow box doesn't have the space and the tank is already running so that ship has sailed.

[sphelps]

Originally Posted by christyf5

I'm of the understanding that in order to do a Herbie overflow you need two holes drilled. The overflow box doesn't have the space and the tank is already running so that ship has sailed.

You can do a herbie with a single large hole (2") but if you're having issues finding parts for a 2" standpipe then building a single drain herbie will be a much greater challenge. Here's a drawing for reference, if it's really something you want I could probably build it for you and ship it to you.

[untamed]

Originally Posted by sphelps

You can do a herbie with a single large hole (2") but if you're having issues finding parts for a 2" standpipe then building a single drain herbie will be a much greater challenge. Here's a drawing for reference, if it's really something you want I could probably build it for you and ship it to you.

I think that is brilliant! I certainly understand how that might work assuming you get adequate flow through the gap between the 1.25" and 2" pipes.

[input80]

Delete, redo.

[input80]

Originally Posted by sphelps

You can do a herbie with a single large hole (2") but if you're having issues finding parts for a 2" standpipe then building a single drain herbie will be a much greater challenge. Here's a drawing for reference, if it's really something you want I could probably build it for you and ship it to you.

Has anyone built/tried this with any success & if so would anyone with the skill/know how care to help me to build one, or even build it for me ? Will pay accordingly.

[Simons]

My durso is completely silent. I do have two 90 deg bends in the lines before it hits my sump however.

[mark]

I'm running 2-2" Dursos and drilled one vent hole in each cap matched for when first running ~2000gph. Strangely they are different sizes (5/32 and 7/32 just checked with an index) but generally overall they are small. Only about 1000gph now but holes still working, not Herbie silent but the Dursos are really really quiet.

Do remember would get the up/down and sucking in the overflow with cap and no hole, small hole would get the variation in the overflow level but no sucking and still a little noisy but once hit the right hole size, the sound just dropped off level stabilized.

Now if I see the level in the overflow moving a bit, know I have a little salt creep to clear.