Today I asked the pool guy at my swim club a few questions. You might be interested in the answers.
How do you test the water?
Answer: shows me the cheapest tester that goes up to 3ppm

Next question. What Chlorine do you use? Do you use stabilizer?
Answer: only liquid, no stabilizer.
Here is the pool in question :

Since the pool gets direct sun for the entire day and they don't use cya I assume they have to add chlorine multiple times a day (I didn't ask)
Interesting, right?
How do you test the water?
Answer: shows me the cheapest tester that goes up to 3ppm

Next question. What Chlorine do you use? Do you use stabilizer?
Answer: only liquid, no stabilizer.
Here is the pool in question :

Since the pool gets direct sun for the entire day and they don't use cya I assume they have to add chlorine multiple times a day (I didn't ask)
Interesting, right?
