Liquid Chlorine

Liquid Chlorine Hot Tub Dose Calculator

Liquid chlorine dosing needs four inputs: tub volume, current FC, target FC, and liquid chlorine strength. The dose scales with the FC increase needed and the size of the spa.

Repeatable Process

  1. Test current FC before dosing.
  2. Set target FC based on your routine.
  3. Enter volume and liquid chlorine strength.
  4. Calculate dose in fluid ounces.
  5. Re-test after circulation and adjust future targets as needed.

Dose Checklist

  • Fresh FC reading taken
  • Current FC entered
  • Target FC entered
  • Strength verified from product label
  • Dose calculated and recorded

Label concentrations vary. Use product label directions and tub manufacturer guidance for handling and dosing boundaries.

Calculate It in Spa Switch

Switch sanitizer mode to Liquid chlorine, enter FC readings, and calculate. The app shows fluid-ounce dose and keeps the same calculator flow used in dichlor mode.

Open Spa Switch on the App Store

If you are switching from dichlor, also read the CYA switch-point guide.