Will Osmolator back siphon into RO/DI water reservoir with this setup?

[torero500]

I was test running my osmolator and realized a problem the other day when testing my max running line in my sump.

Normally, the discharge tube of the osmolator rests well above the operating water level of the sump. This tube is higher than the 5 gallon RO/DI reservoir sitting next to the sump, which contains the dosing pump at the bottom.

When the power fails, my return line back siphons to where there is about an inch of room left in the sump, then stops when the siphon breaks. But at this water level, the discharge tube of the osmolator is now underwater. The power is out at this point. Will the discharge tube back siphon sump water into my RO/DI reservoir? The other day I was running tests, and it didn't, but it really seems like it could have...plus I didn't have the dosing pump sitting in any water. It was just sitting in the cabinet. In normal operating conditions with a power failure, the discharge tube will be underwater, and the the dosing pump will be sitting in the RO/DI 5 gallon container filled with water at a lower level than the discharge tube...

 

[psykokid]

in the event of a power failure and back siphoning is the top of of the 5 gallon jug higher than the level of where the water line from the osmolator goes into the sump? I'm not sure if the osmolator has a check valve built in or not. Id say put an empty jug in there and cut the power to see what happens.

 

[torero500]

In a power failure, the top of the 5 gallon jug will be lower than the water level in the sump because the sump is a 20 tall and will nearly full.

 

[torero500]

So I ran my tests as suggested. Yes, the discharge tube will back siphon into the RO container, but only if I started the siphon myself with a few drags on the hose that connects to the dosing pump. Otherwise, nothing. Seems to be too much air in the coiled excess hose to start a siphon. Not sure if I want to trust that, though, or a check valve.

Only thing I could think of would be a piece of straight 3/4" pvc pipe in the corner of the return chamber of my sump, and have the osmolator discharge into that near the top, so that the discharge tube will never be below the raised sump water level in the event of a failure. The pvc pipe outlet would be below the running level of the sump to prevent splashing noise.

 

[reef_doug]

The osmolator discharge line needs to be mounted higher than the maximum level your sump can hold in the event of a power failure. I turned off my return and used tape to identify the highest level. The osmolator doesn't come with a check valve.

 

[torero500]

I agree, it's just I don't want to hear the splashing of the discharge outlet shooting water about a foot down into the water. I'll either use the tube idea or maybe I can congigure the output so it shoots down the side of the sump.

 

[reef_doug]

A filter sock would make is quiet.

 

[rvitko]

I think the best solution is just to clamp the hose up higher so it is not touching the surface of the water.