DOS tubes "leaking"?

[clifg]

Hi all, quick one. I'm referring to the output tubes on the dos. When I point them straight down they seem to slowly leach into the tank. Right now I have it so the outlets curve up towards the surface, but I'd like to secure the tubes in my holder. Anybody had this issue before or know what could be going on?

 

[homer1475]

With peristaltic pump like the DOS, siphoning should not be happening as the rollers in the pump head keep the tubing pinched.

Are the lines siphoning out to the rollers, or all the way to the containers the liquid is held in?

Check the roller heads, and make sure the tubing is positioned correctly. I would also suggest looking at the fittings on the DOS. They may be leaking air which would cause the line after the rollers to siphon down to those connectors.