Dosing pump lines lose suction

[Kontraband81]

I have been experiencing a problem with my dosing pumps. The exit lines from the pump to the nutrient tank over time leak into the tank. This is noticeable from home assistant charting a gradual uptake in ec as well as the line visually building air pockets next to the pump. I have included pictures but they are not super great illustration.

Is this common, and is there a way to avoid it? Any tips on how to minimize or hopefully eliminate this issue?

They are brand new pumps, the same ones recommended to purchase from the video/part list.
These:

[Shimbob]

Are the pumps physically physically located above the tank? Sounds like gravity is happening.

[Kontraband81]

Are the pumps physically physically located above the tank? Sounds like gravity is happening.

Yes, I have a shelf system that mimics how ledgardner had his in the video. The top shelf is the controller and nutrients, the next shelf below that is the ro tank, and below that is the nutrient tank.

Included some more pictures

[LEDG]

You need to make sure the lines are totally sealed where they attach to the pumps. I used small zip ties and tightened it as hard as I could, using pliers, then I even siliconed over some that were still losing suction. If you seal these joints, they will not leak.

[Kontraband81]

You need to make sure the lines are totally sealed where they attach to the pumps. I used small zip ties and tightened it as hard as I could, using pliers, then I even siliconed over some that were still losing suction. If you seal these joints, they will not leak.

Thanks for the advice I purchased these two items to help the situation.




I am still waiting on the snap grips but just adding the check valves seems to have really helped the situation. They don't allow air to travel back inside the line and from what I can see they don't restrict the liquid flow at all. I tested this by banging the line against something over and over and nothing leaked out. I currently have them hanging off the pumps and into a small cup to test over night if anything leaks. I'll keep the thread updated as I progress but as of right now I highly recommend the check valves.

[LEDG]

Great idea! I may implement this myself.

[Kontraband81]

Great idea! I may implement this myself.

Here is a picture of what I did. I added a little tiny piece of the same silicon tubing on the exit side in order to make them fit nicely in the holes I drilled. When you get them you can test out what way the flow is by blowing into it. Air will only pass one direction.

[morrisraybrooks]

i love it

[stud]

just ordered some to try , thank you