Prepare
Read the spa manual, plan compliant discharge, turn off power as directed, and keep people away.
Spa care calculator
Spa sanitizer & water age
Scale bromine or dichlor label directions, track water age, and follow a drain-and-refill sequence.
Use the product label
Scale a spa sanitizer dose
This planner scales directions printed on your product. It does not invent a generic chemical response.
Conservative scaled plan
0.8 oz
Start with no more than 0.4 oz, then follow the label's circulation and retest directions.
The label still controlsBromine products vary. Confirm active ingredient, strength, application, maximum dose, circulation, and re-entry directions.
- Scaling method
- Label dose × water-volume ratio × requested-change ratio
- Requested change
- 2 ppm
- Why stage it
- Test precision, water demand, product age, and mixing affect the real result.
Spa water age
0 days since refill
90 days until your chosen reminder.
Drain and clean
Use the specified drain method. Clean the shell, waterline, cover, and filter with compatible products.
Refill correctly
Follow the manufacturer’s fill location and air-lock prevention instructions before restoring power.
Restart and test
Balance and sanitize using the manual and product labels. Verify temperature before use.
How to use this result
A planning quantity, not an instruction to pour.
Recheck volume, test reading, product strength, density or purity, and the selected target.
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.