Glad I have & maintain my own pool.
In public pools a lot of this depends on the amount of chlorine they dump in daily to the pool. You can ask!
Please don't say or think it's saltwater, the type of saltwater in pools is just another form of chlorine.
Salt water pools are not chlorine free. Instead, using a device known as a chlorine generator, the pool makes its own chlorine though electrolysis which breaks down the salt.
Public pools generally use higher levels of chlorine than needed in a private pool, simply less of a load to use the available "free" chlorine.
I'll guess most home owners are unaware of the level of chlorine in their pools, service companies use higher levels than needed just to keep their customers happy,
lower levels are safer & adequate.
Ask the folks to tell you the levels they test when they come.
I would be very careful trusting an employee to get the levels correct!
Or better yet get your own test kit
here's info in that.
ABCs of Pool Water Chemistry
There are five chemical levels that every pool owner needs to keep track of:
FC - Free Chlorine - A sanitizer which keeps your pool water safe and free of germs. Chlorine must be constantly replenished. (level depends on CYA)
PH - Acidity/Alkalinity - Needs to be kept in balance to prevent irritation and protect the pool equipment. (7.5 to 7.8)
TA - Total Alkalinity - Appropriate levels help keep the PH in balance. High levels can cause PH to rise. (60 to 120, sometimes higher)
CH - Calcium Hardness - Appropriate levels help prevent plaster damage. High levels can cause calcium scaling. (220 to 350, vinyl lower)
CYA - Cyanuric Acid - Protects chlorine from sunlight and determines the required FC level. (outdoors 30 to 50, SWG 70 to 80, indoors 0 to 20)
Here are four other chemical levels that come up frequently enough that you should at least know what they are:
CC - Combined Chlorine - CC over 0.5 indicates a problem.
Salt - Required with a SWG (Salt Water chlorine Generator), otherwise an optional enhancement.
Borate - An optional enhancement.
Phosphate - Doesn't matter, despite pool store claims otherwise.