"Apex DDR" High Capacity to Size Ratio Automated Dosing Dual Reservoir (Capacity = 4L total, 2L each side)
Brand: Neptune Systems
Item Number: NPTN-APEX-DDR
Regular price
$199.95
On Sale
Only 4 left in stock!

Estimated Arrival: Between Jan 28 and Feb 03. *ETA for USA only. For accurate lead times, call us at 727-214-7750
Large, Custom, Or Backorder: Arrival Times May Vary.
Shipping Policy: Little or No Shipping Charges for Regular-Sized Items; We Cover Part of the Freight Costs for Large Items Shipped Nationally. See Shipping Policy.

Two-part liquid storage automation made simple.
- High Capacity to Size Ratio = each side stores two liters (2L) of fluid
- Connects directly to your Apex DOS
- Optical sensors inform your APEX in real-time when dosing levels inside the DDR reservoirs are low
- Cast-acrylic constructio
- Low-profile with Low Center of Gravity = stays put and doesn't tip over easily
- Easy to refill
- Push-fit tubing connections
- Use for 2-part (Alk/Calc) additives as well as other applications
Style Meets Function, Deceiving Capacity and No-Tip Design
The DDR has great style and will stand out in anyones equipment room. But it’s not just about style. It may not look like it, but each side of the reservoir holds an ample two liters (2000 mL) of fluid. For most saltwater aquariums that are dosing Calcium and Alkalinity to their aquariums, this amount is more than enough to last at least two weeks. If you were dosing other additives it might last months before needing a refill.
Speaking of refills, the DDR has easy lift off lids that make refilling it super easy.
The DDR was also designed to have a low center of gravity. This means, unlike other reservoirs on the market, it is very difficult to inadvertently tip over and ruin your day.
Connect Directly to DOS Pump
The DDR is the only dosing container on the market that connects electrically to your DŌS and uses optical sensors that alert you when your fluid has approximately 20% remaining.
Optical Sensor Alerts
One simple connection links the DDR to the DŌS. No worries about fooling around with loose wires, float switches, etc. Just plug it in and it will show up in your Apex Fusion Dashboard.
Dimensions: 10.5"L x 5.5"W x 8.5"H
Capacity:
- 2L / 2000mL per side
- 4L total capacity
Weight: 2 lbs
What's Included:
- (1) Apex DDR Dosing Reservoir Body
- (1) 4m Roll of DOS Tubing
What's Needed (Not Included):
- Neptune Apex or Apex EL Systems for connection with Apex Fusion
Here is a video where Terence from Neptune Systems give us an overview of the Neptune Systems DDR and talks about What the DDR is Typically Used For, Low Center of Gravity (will not tip over easily), How to Install, Optical Sensors, and an Apex Fusion Software Walkthrough. Thanks Terence!
Have any further questions that aren't answered here? We'd love to hear from you, and learn how we can help you be as successful as possible in this wonderful hobby.
You can call in to 727-214-7750 to speak with Tyler from our team to determine how to create your Ideal Aquarium Build.
Also feel free to reach out to us at info@twotidesaquariumsupply.com and we will aim to respond back within the next few hours.