Need some advise and recommendations on water balance and chlorine demand. Have a fairly new hot tub and thought I knew what I was doing until I found this site. After I developed a rash, which I think was linked to a reaction to MPS I decided to start over with a decontamination and follow the balance and sanitizing methods mentioned here.
After a decontam of 100ppm of chlorine and a fresh fill I have the following water balance numbers:
Fresh fill: CH 100
After adding 3 oz. Calcium Chloride,12 oz Gentle Spa(Borate),and 7 oz Dry acid over a period of 4 hours.
Day 7 CH 140
Day 13 CH 140
I have never before been able to maintain a consistent PH value. The PH now does not fluctuate. Before soaks it's usually 7.4, after 7.6
Am I O.K, water looks and feels great but the saturation index on the Taylor kit shows -.04
Chlorine demand: The fresh fill 24 hours later showed a 30% usage.
If the tub is not used it seems to utilize 3ppm per day. In measuring the amount of chlorine used by a soak is it correct to measure the chlorine before and right after a soak? The usage numbers reported in other post are as much as 7ppm per hour. I have only seen ours at a maximum or 3ppm per hour. Am I reading this incorrectly. What in your opinion should the chlorine level be prior to soak? If I test chl before a soak and it's 3ppm and test after a soak and its 2ppm,knowing I use 3ppm in 24hrs. I would add 4ppm so in 24 hrs at the next soak it would be at 3ppm. Am I thinking correctly on this? ANy comments would be appreciated.