DDR DOS Dual Reservoir

Neptune wanted cash to replace the sensor because of damage due to spillage. It's almost impossible to avoid all spills and just a little bit of anything seems to destroy this unit. Time for a re-engineer on this one!

sensor fell on 2 of these apex sells junk look at there reviews on all there add ons

Sensors keep failing. Also shipping at my expense to get it repaired to Neptune is ridiculous. Don't waste your money.

The board failed due to damage from liquid spilling on the top. It's almost impossible to keep a dosing container completely dry. Not useable in my setup.

It worked fabulously until one sensor broke off of its bracket within the container well within a year of purchase. Looking back, I wish I had just left it there sitting on the bottom. But instead, I jumped through all of the hoops required to send it back at my own expense and got it back in apx 2-3 wks. When I got it back and attempted to reinstall, the plug partly pulled off of the wire (there are no less than 8 TINY single wires within the wire which feed into equally tiny holes in the plug) which had to be reinserted before it would work. Got that done with surgical loops and a significant amount of effort. Once successfully reinstalled I noticed that the alk was now creeping up the wire on the side with the new sensor such that it continuously cakes up around where it exits the container and all around the lid. Alk crumbles now go everywhere each time I open the lid, including inside the container where I worry about it clogging up the pump. When I attempted to remove the unit to clean off said crumbles, the ENTIRE plug pulled away from the wire despite my greatest care. So now it's messy AND the sensor doesn't work. But I just don't think I'm up for dealing with Neptune again for repair. May just pull the sensor out of that side and use it as a vessel only, albeit a fancy one. It is a huge disappointment for something that was so expensive. I think they could do a lot to improve the design and make it very functional. I cannot recommend it in its present state, however.

Slick looking unit, but the optical sensors fail and there is no way to reset them. One failed in the on position so my APEX thinks my fluid is low, when it is not. I've cleaned the sensor and restarted the APEX, but it's still dead.

Neptune should remove the sensors, lower the price to $100 and they would still sell quickly

I'm not sure why others have had problems with these. I bought two of these, two years ago, thinking I could use one to dose Vodka and Vinegar. I found out after purchase that this would ruin the unit, so I have never used it. The other though, has been dosing 2 part the entire time with no problems. The quality is obvious. These are beautiful units that are aesthetically pleasing when matched to other apex equipment. I have never had a problem with the sensors. Not sure what would cause them to fail. The question to ask yourself is, do you need the level sensor for your purposes. This is an expensive solution for holding liquids. I like having access to the information and didn't mind the cost, but honestly it is the least important information I glean from Fusion. It's not hard to look under the cabinet every couple of weeks to monitor levels by eye. If I fill it before I leave for a trip, I am not worried that it will run out before I get back. Still, I am a geek for control, and they are pretty to look at, so I am glad I bought them.

FWIW, Neptune is frustrating when there is an issue to resolve. I have had to call them on a couple of occasions and it just took way too long to get a satisfactory solution. Over 30 days to get a EB8 (under warranty) replaced. They just did not want to take it back until they were convinced I wasn't the problem. When I did get it back, it had to be reprogrammed for all of the outlets to work correctly, which Neptune could never help me do correctly. After a lot of tinkering with through the console I figured it out, but I was more than frustrated.

I would only recommend with reservations. I like the look and stability, but the sensors failed in 2 months. I assume it's the sensors, since the solution level indicators disappeared from my Apex Fusion for no particular reason. Rebooting doesn't help. This seems to be a very common problem. Fortunately for me my unit is visible so I can just keep an eye on the levels, but if you are putting the unit somewhere not visible to you and you need to depend on the sensors, look for something else.

I was able to fix the line fittings and air bubble problem that people noted by dipping the end of the tubing in hot water for a few seconds and then pushing the tubing all the way over the fitting bib and snug against the unit.

All in all I'm happy that I made the investment in a doser. Great convenience for me.

Nice looking unit, stable base. A bit small for a tank with medium or high demands for CAL and ALK but fine for most tanks I suppose. First impression of the unit was great, seemed like a quality product, set up was simple and straight forward.
The Jon guest fittings on this unit are a complete disaster coupled with the rigid air line tubing used as the connection is horrible and no way to keep micro bubbles from seeping into the lines and causing air gaps. This is my largest complaint about the unit. NOTHING works to keep air out. No matter how tight you get the fittings on the DOS or how far you get the tubing inserted or bottomed out in the DDR fittings it will over a few days have a large air gap in the lines which will affect accuracy of the dose. After months of frustration, searching for answers and trying many times to Reinstall the lines I finally got in touch with a neptune support Rep, that was an ordeal. The person was helpful and polite over the phone as I explained everything I tried and where the air is coming in at plus I can tap the lines and watch bubbles come up from the DDR connections. I was sent out two new replacement jon guest fittings with glued in acrylic tubing to install in my DDR. This was supposed to ''fix'' the issue but sadly it did not and the same issue is still happening with this unit. Absolutely disgusting issue for such an expensive cheap product. Feel I should not have to modify this unit into a DIY project for the amount paid in attempt to keep it from drawing air into the lines.
Better connections used from factory would benefit this dose container since this issue is common and a pain to deal with having to purge air from the lines every few days.
Save your money and purchase a better container.

The water level sensors failed twice.

Sensor died on DDR (actually the port on the DOS is what failed, when i move the DDR to different DOS it works fine) within 7 months. Since the DOS is still actually working and dosing my system, Neptune refused to charge me for a new one and send to my house so that i could swap with the already working unit and send back for service... They wanted me to take it out of my system and wait 2 weeks for repair, and going off these other reviews i'm glad i didn't send it to them - horrible customer service, manager yelling at me on the phone over something so common sense, the purpose is to improve your service not sell lemons, and at 450$ a pop i would expect better practices - shame.

Sensor failed twice in less than one year after purchase. Not much help from Neptune Systems. Would not purchase again.