Free tool
TDS Calculator
Estimate the total dissolved solids after mixing two water sources. Use it for planning water changes, then confirm with a meter and full water tests.
Total Dissolved Solids (TDS) Calculator
Estimated mixed result
Estimate only. TDS does not replace GH, KH, ammonia, nitrite, nitrate, pH, or temperature checks.
How to use it
Enter the gallons and TDS for two water sources. The calculator estimates the mixed TDS after the water is combined.
Add in steps
For shrimp tanks, make smaller changes, let the water mix, retest, then adjust again if needed.
| Use case | What to check next |
|---|---|
| Neocaridina | Compare TDS beside GH, KH, ammonia, nitrite, nitrate, pH, and temperature. |
| Caridina | Use RO or remineralized water habits and avoid fast swings. |
| Water changes | Match temperature and avoid large parameter jumps. |
Pete’s take
Stability beats hitting an exact number. Shrimp handle a steady target better than a tank that jumps every week.
How To Use TDS For Shrimp And Freshwater Tanks
TDS is a quick stability signal, not a full water test. Use this calculator when mixing tap, RO, or remineralized water, then confirm GH, KH, ammonia, nitrite, nitrate, pH, and temperature before making livestock decisions.
For shrimp tanks, avoid large sudden TDS swings. Match water changes slowly, test consistently, and use the Equipment Finder if you need shrimp-safe filters, test kits, or water-change tools.
Use the Aquarium Equipment Finder Read Shrimp Keeping Guides