Originally Posted by
BluewaterLa
Are you using the DDR ??
I have the DDR and have been suffering with this same issue on pump one with my Alk solution.
Air building up in the lines over night and eventually causing large gaps of air that mess with the amount dosed to the tank at times.
Very frustrating for sure.
I have searched high and low for a cause with nothing fixing this issue. My tubes were all the way up onto the dose heads and screwed so tight that the plastic may break.
No cracks in the plastic head, No splits or holes in the new tubes from Neptune and even installed check valves on the end of the lines, all with NO FIX, still getting air.
After getting super fed up and getting No answers or support I gave one last attempt to find the source of air getting into the lines. Pump two gets some but just small air pockets and isnt much of a concern but is annoying being I crapped out 500 bucks for a head ache.
Needing to refill my DDR on both sides I proceeded to fill the containers and after both were filled I decided to remove the line for pump one at the DDR fitting and cut the line again with tubing cutters and shove that sucker in as far as it will go just to rule this out YET AGAIN.
After doing this and purging all the air out I took a seat in front of the stand and had a flash light on the lines looking intensely for air bubbles.
I noticed the smallest little bubble come up from the DDR fitting and up the tube it went. Then a while later another one.
I lightly tapped on the line from the DDR to the DOS and guess what a few more micro bubbles came up the tube.
Did the same to the pump 2 side and the same thing happened So I installed the blue lock rings onto the fittings to keep the fitting tight hoping for a fix. NOPE it still is purging micro bubble here and there up the tubes to collect into large air gaps in the lines over time.
There is Zero air bubbles in the DDR stuck to the sides, in the solution OR in the pick up tubes on the bottom of the jon guest fittings.
What I think is that the pick up tubes under the fittings are not sealed or sealed correctly and are allowing air to enter at small amounts.
I have not drained the solutions and removed the DDR to get a better look at how this is installed or if I can remove them / replace them or reseal them the right way since I have found the source of my leak.
So if you are using the ''well built'' DDR do your self a huge solid and wiggle the lines, bump them or just watch for micro bubbles coming up from the pick up tubes. You may have the same issue I am having and need to figure out a fix.
Ridiculous to have such an issue with new costly equipment.
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