Jebao Programmable Auto Dosing Pump DP-4, Black

This Doser is super awesome and for the price you cannot beat it. Do not expect anything fancy, it works, and it is accurate. It is just a couple of boards with a shell connected to dosing heads. No fancy apps or remotes you just set it and forget it. One thing to keep in mind is that if you have issues with it not keeping the schedule and time you set that you may have to replace the internal memory battery or make sure the contacts on the battery are not bent out of shape. In my experience, I set it and when I unplugged it would reset the time and schedule. I then opened it to check to see if it had a battery and it did. I checked the battery, and it was reading the proper voltage. I noticed that the contacts were barely touching, so I bent them slightly and it worked as advertised.

This dosing pump is reliable. I've purchased two. One in 2017 and one in 2023.I rely on this pump to keep my alk mag and cal levels stable and it has not failed my SPS or clams

Construction:The buttons, LCD, and pump heads seem to be of pretty high quality, though the case feels cheaply made. The power jack on the unit I received has a poor connection and the unit will lose power if the cord is angled incorrectly. This is mostly just an annoyance since the unit is secured inside the tank stand. The cord that comes with the unit also sticks straight out of the back, so although the unit itself is only roughly 6 inches deep, you need to provide an extra inch or so of clearance for the plug. Space in my stand is at a serious premium, so this wasn't an option for me. I had to buy a new AC power adapter with a 90 degree barrel plug in order to reduce the clearance in the back.Although the instructions state that the unit isn't waterproof, mine survived, so far without issue, after being sprayed with several gallons of saltwater due to a burst pipe fitting on the tank return. While I wouldn't recommend replicating my unintentional experiment, it does seem to prove that the unit is fairly durable.Use:The unit doesn't come with tubing, so you will need to pick up some airline tubing before you can get started.The instructions are poorly written in broken English and are missing words or pictures in key steps- don't bother trying to use them. Champion Lighting has a much more clear and complete version here: http://www.championlighting.com/pics/doserpics/Jebao-DP-4-Instructions.pdfProgramming isn't completely intuitive, but is fairly straightforward and isn't nearly as difficult or time consuming as some reviewers make it sound. You will need to set the time and the volume of each separate dosing event on each pump, so this could get tedious if you're dosing more than a few times a day, but if you're only dosing 3-4 times a day you can easily reprogram each pump in about a minute.Once calibrated and programmed the dosage is very precise and consistent. It will retain the settings even if power is lost.When running, the pumps are pretty noisy- probably loud enough to hear over a TV at normal volume. In most applications they wouldn't be set to run for more than a few seconds so that's not likely to be a problem in most cases. However, if the tank is in a bedroom and you're a light sleeper you may want to set the unit to only dose during times when you won't be sleeping.

There is nothing on this doser to prevent siphoning. I had it running less than 24 hours and I noticed one product had 350ml missing out of 450. It was supposed to dose 25ml per day. It turned out the hoses were siphoning additives out at extreme rates. This is unacceptable. There is no way to contact the seller either being out of china. Be very careful if you decide to purchase this. Note that this happened with 2 of the 3 pumps I had it connected to. I would rate this a very low quality item and I regret my purchase.

Came in today. Was pretty pleased on how the original box was in perfect shape.Everything inside the box looks in order, item as described. Will be testing a run soon after the weekend.Update: Accurately precise when well calibrated, stumbled over one video from Utube by FishOfHex. He probably has the better video instructions on setting up this unit, very easy to understand with his step by step walk through in calibration and time/schedule and final setup.Do take note that in calibrating your unit, you should use airline tubing cut-to-fit the unit’s final placement. If you do calibrate the unit with a different length of airline tube compared to the final length of airline tube you will be using for the unit’s final placement, then there will be a slight if not a huge difference (depending on how long or short the airline tube will be used) in the amount of dose the unit will pump in. So, the longer tube you’ll be using for placement compared to the original length you used for calibrating will therefore result to an under dose and an overdose if the airline tube is shorter than the ones used for calibrating it.Update: Seems to be working very well!One final point though, if you’re using a longer airline tube to feed the pump as directed by FishOHex, make sure the feed cycle does not exceed 250rotations/cycle. When calibrating at a 100ml, the unit only permits a maximum of 250rotations/cycle. With a longer airline, you won’t be able to achieve this.The key is Manual Feed the pump with the additive you desire, make sure the line is filled with the fluid then you can start calibrating it with a 100ml, this way you will not consume all the 250pump rotation/cycle. This is how accurate it can get, it’s spot on!