Need help with tank plumbing

[Joel Franco]

I am currently using a 1 1/2" dorsal down pipe for the drain reduced down to 1" before the bulkhead. No issues here. I am having issues with the return line. I have the anti siphon hole drilled into the 3/4 elbow and everything works fine but I am getting a siphon at the surface and occasionally bubbles. How can the surface siphon be eliminated?

 

[abecker]

Do you mean a siphon when you turn off the return pump until the hole is at the water line?

 

[CastAway]

FWIW, I'm finding my anti-syphon hole to be too small. Sucks air too long, allowing a syphon. It breaks way before it's an issue, so I have not addressed it. Is this what's happening with yours? Could the hole be too small?

 

[Joel Franco]

The surface siphon issue only occurs while the pump is pumping water into the tank. It looks like a mini tornado and once it gets close enough to the outlet pipe and gets blown into bubbles.

 

[Joel Franco]

It's possible that the hole may be too small.

 

[CastAway]

Oh, well that doesn't sound like a siphon at all, just turbulence. Perhaps you can re-direct the output down a little, away from the surface.

 

[Joel Franco]

How are you guys running your inlet pipe? After the bulkhead going into the sump the pipe is going straight down and creating a lot of noise. How can that be reduced?

 

[CastAway]

Hmm. Maybe I am just confused on terms. Or, maybe a picture will help. I may be tripping on the word "inlet".

So typically a siphon break would be in the supply line, above the opening of the supply line. Right?

 

[Joel Franco]

The overflow pipe would be the inlet down to the sump. I have the 1" pipe going straight into the sump and about 3" in the water with no turns.

 

[CastAway]

Is this what you have going on?

 

[Joel Franco]

Yes. Exactly. I guess the pump is too strong and it's making pressure siphons on the surface. Can I post a video?

 

[CastAway]

Yes. Exactly. I guess the pump is too strong and it's making pressure siphons on the surface. Can I post a video?

Sure. Best to use YouTube or Google, as you have to share a link/URL.