Recheck volume, test reading, product strength, density or purity, and the selected target.
Water exchange calculator
Water replacement
Mass-balance dilution with non-zero refill-water concentration.
Your measurements
Enter known values
Values stay in this browser. No chemistry details are sent anywhere.
Calculated planning amount
44.4% water exchange
6,667 US gal (25,236 L)
Before actingNever fully drain without checking structural, groundwater, liner, and discharge risks.
- Formula
- (current − target) ÷ (current − refill)
- Assumptions
- Perfect mixing is assumed. Confirm groundwater, discharge, liner, and structural risks before draining.
- Source
- Mass-balance methodology · verified July 22, 2026
How to use this result
A planning quantity, not an instruction to pour.
Use the label’s application method, protective equipment, maximum dose, spacing, and re-entry directions.
Never combine chemicals. Add one product at a time with circulation as directed.
Start with the staged amount, allow the label-directed circulation time, and measure again.