Calculator Inputs
Formula Used
We compute the bromide increase needed, then convert it to sodium bromide mass.
- Δppm = max(0, Target − Current)
- Bromide grams = (Δppm × Volume(L)) ÷ 1000
- NaBr grams = Bromide grams × (MW NaBr ÷ MW Br) ÷ Purity
- MW NaBr ÷ MW Br ≈ 1.287
- Activation estimate: chlorine ppm ≈ bromine ppm ÷ 2.255
How to Use
- Measure your total water volume.
- Enter your current bromide reading, if known.
- Choose a target bromide bank (often 20–40 ppm).
- Enter product purity from the label.
- Press calculate and add the shown sodium bromide dose.
- If desired, use the activation estimate to start up.
Example Data Table
| Scenario | Volume | Current (ppm) | Target (ppm) | Purity (%) | Estimated NaBr (g) |
|---|---|---|---|---|---|
| Small container | 200 gal | 0 | 30 | 98 | ≈ 29.9 |
| Medium container | 400 gal | 5 | 30 | 98 | ≈ 49.9 |
| Metric example | 1,500 L | 0 | 25 | 95 | ≈ 50.8 |
Example values are illustrative. Actual dosing depends on testing and product label.
Notes for Garden Water Systems
A bromide bank is a reserve of bromide ions that can be oxidized into active bromine. Always follow product labels and local guidance.
- Re-test after dosing, especially when topping up water.
- Use a scale for best accuracy; spoon estimates vary.
- Keep records using CSV/PDF downloads for repeatability.