How to Dosing for Tank Automation - Step by Step
Step-by-step guide to Dosing for Tank Automation. Includes time estimates, tips, and common mistakes to avoid.
Automating dosing is one of the most effective ways to stabilize alkalinity, calcium, and magnesium in a reef tank without daily manual additions. This step-by-step guide walks through a reliable automation workflow for two-part or kalkwasser dosing, with a focus on accuracy, safety, and long-term consistency for demanding coral systems.
Prerequisites
- -A functioning reef tank with established salinity between 1.025-1.026 SG and stable temperature between 77-79 F
- -Dosing pump or controller-driven doser with at least 2 heads for two-part, or 1 dedicated pump for kalkwasser
- -Reliable test kits or digital testers for alkalinity, calcium, magnesium, and pH
- -Graduated cylinder or measuring container for pump calibration in mL
- -Dosing containers with lids, rigid tubing or dosing lines, and check valves if recommended by the manufacturer
- -Known tank water volume after rock, sand, and sump displacement
- -Basic understanding of daily alkalinity and calcium consumption
- -A controller, app, or automation platform capable of scheduling, monitoring, and sending alerts
Before automating anything, determine how much alkalinity and calcium your system really uses in 24 hours. Test alkalinity at the same time for 3 consecutive days with no manual correction except maintaining salinity, then calculate the average drop in dKH per day. For calcium, test daily or every other day and look for a consistent trend, since calcium moves more slowly than alkalinity in most reef tanks.
Tips
- +Use alkalinity as the primary control metric because it changes faster and is easier to fine-tune than calcium
- +If magnesium is below 1250 ppm, correct it first because low magnesium can make alkalinity and calcium harder to stabilize
Common Mistakes
- -Starting automated dosing before confirming actual consumption
- -Testing at different times each day, which can skew the apparent dKH drop
Pro Tips
- *Dose alkalinity during the nighttime window in more frequent increments if you want to reduce the normal overnight pH drop without relying entirely on kalkwasser.
- *Keep alkalinity and calcium dose outlets separated by several inches in a high-flow sump zone and stagger them by at least 10 minutes to minimize precipitation.
- *Use a monthly 100 mL verification test on each pump head, even if the doser seems fine, because small drift in mL output can become a major dKH error over time.
- *For kalkwasser, mix new solution gently and let it settle before dosing, then pull from the clear upper portion rather than the slurry to reduce clogging and erratic delivery.
- *If your controller supports virtual outlets or logic rules, create a maintenance mode that pauses dosing automatically during water changes, return pump shutdowns, and sump level anomalies.
Keep a clean backup log for test day.
The Printable Reef Logbook gives you water testing, dosing, maintenance, and livestock worksheets you can print or save as a PDF.