I know what most will think, here we go again with another person that won't read.
i assure you I've spent a few nights reading every available post about this issue in every page of this sub forum.
new out the box DOS unit, using factory supplied tubing connected to the DDR.
read all available get started information a few times as well.
my unit is mounted to the side wall of my cabinet almost level with my sump. DDR sits directly below the DOS. Lines run from the out to my ice cap sump about 3 1/2 feet of tubing and held in place by factory tube holder on sump.
installed tubing, ensured tubing was all the way into the John guest fittings on the DDR with flat cuts from tube cutting tool.
tubes are all the way pressed onto the DOS fittings and the compression nuts are silly tight on all four lines.
problem number one I experienced was with the left or number 1 pump upon priming. It seemed to pull liquid up about 8" and would not continue toward the pump head amd slowly bleed back down.
I eventually help the button long enough to get fluid up and around the rollers and all air out the line.
fusion showed over 280 ml dosed during this process with pump one.
pump two / right pump absolutely no issue and primed silly quick as it should have.
after priming I did do the manual set up and calibration process
one pump showed 40 ml and two pump showed 39.4 ml.
completed process and programmed.
after programming the pumps I decided to take a gander at this new piece of equipment in action so I sat by the open stand and waited.
this was about 2 hours after initial set up and programming.
flashlight in hand I noticed air bubbles / gaps in the out line to sump for pump one.
checked all the fittings again, jogged priming/ manual button to remove all air once again.
pump worked by dosing tiny amounts.
went to sleep.
next morning tested my DKH and noticed a drop in level as if the pump didn't dose.
checked fusion and pump one kept pace with pump two for equal amounts dosed.
checked the DDR and calcium in chamber 2 was lower than chamber one with Alk solution.
found air gaps in the pump one line to sump again.
pump one turned on and one drop came out as the pump continued and nothing else.
primed line again.
checked a few hours later and same process.
Frustrated and tired eyed from all the reading of similar issues along with recommendations/ solutions I decided to get a little wire management done and keep an eye on the line for air entry.
what I found is that the end of the tube seems to develop an air pocket eventually getting large enough at the end of the tube that nothing comes out when the pump tries to dose 0.7 to 1 ml.
this isn't what I expected out of a $450 piece of equipment and had to install my bubble Magnus back on the tank to keep my levels from swinging in my sps reef.
are there any issues known you guys are familiar with that would cause this ?
i could see it if my tubing was vertical but it's only vertical for a couple inches bending into the sump.
should I remove the pump head and look at some common areas known for cracks or weakness ?
or just open a support ticket with Neptune and hope I get a response.
thanks for your time
good luck and happy reefing
bluewaterLa / Mike
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