Sanitizer recovery field outcome
Free chlorine recovered from 0.5 to 2.5 ppm in six days
A recorded 2.5-gallon liquid-chlorine treatment raised free chlorine from 0.5 to 2.5 ppm by the next service visit while pH moved from 7.9 to 7.8.
San Diego County, California · April 30 to May 6, 2026 (6 days)
- Free chlorine
- 0.5 ppm2.5 ppm
- pH
- 7.97.8
- LSI
- +0.32+0.23
The situation
- Low free chlorine and elevated pH at a routinely serviced residential pool.
Starting readings
- Free chlorine: 0.5 ppm
- pH: 7.9
- Total alkalinity: 90 ppm
- CYA: 35 ppm
- Calcium hardness: 450 ppm
- Recorded LSI: +0.32
Treatment recorded
- 2.5 US gallons liquid chlorine
- 0.43 US gallons muriatic acid
- 3 trichlor tablets
- Normal circulation between visits
Follow-up readings
- Free chlorine: 2.5 ppm
- pH: 7.8
- Recorded LSI: +0.23
- Total alkalinity, CYA, and calcium hardness were unchanged in the follow-up record