The Eshopps dosing pump is a peristaltic dosing pump designed for reef aquariums that need precise, automated delivery of two-part solutions (calcium and alkalinity supplements), trace elements, or other liquid additives. It uses flexible tubing compressed by rotating rollers to move fluid in controlled, repeatable volumes on a set schedule. If you're tired of manually dosing your reef every day and want consistent calcium and alkalinity levels without a calcium reactor, the Eshopps dosing pump is a practical entry-level option.
This article covers how the Eshopps dosing pump works, how to set it up and calibrate it, what it's suitable for (and what it isn't), and how it compares to alternative dosing methods.
How Peristaltic Dosing Pumps Work
A peristaltic pump uses a motor to drive rollers over a section of flexible tubing. As the rollers compress and release the tube, fluid is pushed forward in a consistent volume per revolution. The key advantage over gravity-fed drippers or manual dosing is repeatability: once calibrated, the pump delivers the same volume every cycle regardless of fluid viscosity differences.
For reef tanks, this matters because calcium and alkalinity supplements are usually dosed multiple times per day in small amounts. Splitting the daily dose into 6 to 12 small additions throughout the day is far better for coral health than dumping the full daily dose in once. Large doses cause temporary spikes in alkalinity that stress corals and can cause precipitation, pulling calcium and alkalinity out of solution as calcium carbonate.
Eshopps Dosing Pump Specifics
The Eshopps dosing pump comes in single-head and dual-head versions. The dual-head model lets you dose two separate fluids simultaneously, perfect for dosing part A (calcium chloride) and part B (sodium bicarbonate or sodium carbonate alkalinity) at the same time from separate containers. Each head runs independently with its own timer settings.
The pump head runs off a small DC motor with a digital controller. You set the number of doses per day and the volume per dose through the front panel buttons. The controller displays settings and lets you calibrate the pump against a measured volume.
Calibrating the Eshopps Dosing Pump
Calibration is the most important setup step. Without calibrating, the volume per dose may be off significantly from what the controller displays.
Step 1: Fill the Tubing
Run each dosing head briefly to fill the tubing from the fluid container to the tank outlet. Any air in the tubing compresses during pumping and causes volume inconsistency.
Step 2: Measure Actual Output
Set the pump to run for a fixed period, like 60 seconds at full speed. Collect the output in a graduated measuring cylinder or syringe. Compare the measured volume to what the controller expected to deliver. For the Eshopps, the expected output is typically labeled in mL per minute at full speed.
Step 3: Adjust Settings
If the measured output is 10 percent higher than expected, your actual volume per dose is 10 percent higher than the setting. Adjust your dose settings accordingly. Recalibrate every 3 months or when you replace the dosing tubing, since tubing wear changes its compressibility and therefore the volume per compression.
Setting Up Two-Part Dosing with the Eshopps Pump
Two-part dosing is the most common use case for the Eshopps pump in reef aquariums.
Calculate Your Daily Demand
First, determine how much calcium and alkalinity your reef consumes daily. Measure your alkalinity at the same time for 3 to 5 consecutive days without dosing. If alkalinity drops from 9.0 dKH to 8.3 dKH over 24 hours in a 75-gallon tank, you're consuming about 0.7 dKH per day. Convert that to the volume of solution needed to restore it based on your supplement brand's concentration (usually labeled on the bottle).
Calcium and alkalinity consumption should roughly match in a healthy mixed reef with natural coral-to-water ratios.
Distribute Doses Throughout the Day
For a daily requirement of 50mL of part A and 50mL of part B, split it into 12 doses of approximately 4mL each, every 2 hours. The Eshopps controller lets you set the number of doses per day and the duration per dose. This frequency of small additions keeps parameters stable and reduces stress on corals.
Start Low and Increase
When beginning two-part dosing, start at 50 to 75 percent of your calculated dose for the first week. Measure alkalinity daily and increase the dose gradually until you're maintaining your target. Jumping straight to full calculated dose risks overshooting.
For product comparisons across dosing systems, the best dosing pump for reef tank guide covers the Eshopps alongside options from Neptune, BRS, and GHL.
What the Eshopps Dosing Pump Is Best For
The Eshopps pump is a practical choice for specific situations.
Smaller and Mid-Sized Reef Tanks
For tanks under 100 gallons with a moderate coral load, the Eshopps pump delivers adequate precision and reliability at a reasonable price point (around $80 to $120 for the dual-head model). It handles typical two-part dosing for mixed LPS and soft coral reefs without issue.
Simpler Additives Beyond Two-Part
You can also use the Eshopps pump for iodide, strontium, or other liquid trace element supplements that require precise small volumes. Any liquid additive where consistency and timing matter benefits from automated dosing versus manual addition.
Entry-Level Reef Automation
If you're new to dosing and want to transition from manual water changes as the primary calcium/alkalinity management tool, the Eshopps pump is an accessible starting point that doesn't require programming expertise or integration with an aquarium controller.
Limitations of the Eshopps Dosing Pump
Understanding where the Eshopps pump falls short helps you make the right decision.
No Controller Integration
The Eshopps pump operates standalone. It doesn't integrate with aquarium controllers like Neptune Apex, GHL Profilux, or Reef Factory Smart Controller. If you want your dosing pump to respond to pH probes, temperature sensors, or calcium monitors, you need a controller-compatible pump like the BRS/Neptune Trident or a GHL P4.
Limited Dose Precision at Very Small Volumes
For tanks that need very small doses, under 1mL per dose, peristaltic pumps can struggle with consistency due to tubing compression variation. Neptune's COR and the Kamoer X4 Pro handle micro-dosing more precisely.
Manual Monitoring Required
Without controller integration, you still need to test alkalinity and calcium regularly (weekly at minimum) and manually adjust pump settings as your coral load changes seasonally. The pump automates delivery but doesn't adjust dose based on feedback.
For a broader comparison of reef dosing equipment including calcium reactors, kalkwasser stirrers, and advanced dosing systems, the best aquarium dosing pump guide covers the full spectrum.
Maintaining the Eshopps Dosing Pump
Maintenance is minimal but important for accurate delivery.
Tubing Replacement
Dosing tubing stretches and loses elasticity over time. Replace the tubing every 6 to 12 months depending on use. Eshopps sells replacement tubing kits, or you can use compatible silicone dosing tubing from other sources. Always recalibrate after replacing tubing.
Cleaning the Pump Head
Calcium deposits can build up in the tubing and at the outlet. Flush the dosing lines monthly with RO/DI water by running the pump briefly with the tubing end in a cup of fresh water. If calcium has crystallized on the outlet tip, soak the tip in white vinegar for 10 minutes.
Checking the Dosing Containers
Keep part A and part B solutions topped up. Running the pump dry pulls air through the tubing, which causes volume inaccuracy. Most hobbyists mix a week's worth of solution at a time and label containers clearly to avoid mixing up part A and part B.
FAQ
Can I use the Eshopps dosing pump for kalkwasser? Kalkwasser (calcium hydroxide) solution is caustic and can damage standard silicone dosing tubing. Some hobbyists use it with appropriate chemical-resistant tubing, but dedicated kalkwasser stirrers with submersible pumps are better suited for kalkwasser delivery. The Eshopps is better used for standard two-part solutions.
How accurate is the Eshopps dosing pump? After calibration, the Eshopps pump is typically accurate to within 5 to 10 percent. For most reef setups, this is sufficient. If you require tighter precision for sensitive SPS corals, controller-integrated systems with flow sensors provide better accuracy.
What size tank is the Eshopps dosing pump appropriate for? It works well for tanks from 30 to about 120 gallons. Larger reef systems with heavy SPS loads typically consume enough two-part to require larger-capacity dosing pumps or a calcium reactor, which is more cost-effective at high demand levels.
How do I know if I need a dosing pump? If you're manually adding two-part solutions daily and experiencing fluctuating alkalinity levels (more than 0.5 dKH variation day to day), or if you're missing doses because it's inconvenient, a dosing pump adds real value. If you're doing large weekly water changes with a high-quality salt that restores parameters naturally, dosing is less necessary.
Key Takeaways
The Eshopps dosing pump is a straightforward, reliable option for entry-level reef dosing without controller integration. It handles two-part dosing for tanks up to 120 gallons, is easy to calibrate, and requires minimal maintenance. The main limitation is the lack of controller integration, which means you still need to test and manually adjust settings as your reef grows.
Calibrate it carefully on setup, replace the tubing annually, and test your alkalinity weekly to catch drift before it affects your corals. For most hobbyists with a mixed reef under 100 gallons, it delivers what it promises at a reasonable price.