The Texas health code provides for the chlorine in commercial swimming pools to be between 1-8ppm.
We service mostly residential pools on a weekly basis. We used to manage towards 4ppm (parts per million) as a maintenance level on most pools that we were servicing on a weekly basis.
If you are able to check your water on a daily basis then you can go with a lower chlorine – perhaps as low as 1-2ppm. If you try going this low without anything else to help the chlorine do its job (such as an ozone oxidizer or mineral pack) then keep in mind that a good storm or some rain water can lift the pH and render 80% or more of the chlorine ineffective. Without anything as a backup you may find yourself with a pool turning colors within days. You can make the necessary adjustments and get away with running it low if you really know what you are doing and are checking it daily… however we like to have a little more breathing room if we don’t have anything else helping the chlorine do it’s job.
We are now able to run the pools on our weekly swimming pool service at a slightly lower chlorine level with the help of a mineral pack. Most of our pools are on the 1-3ppm range depending on usage needs and bather load. The more things that can impact the pool water the higher you need to run the chlorine. Water change drivers can include: bather load, debris such as leaves, dust sand and pollen, and exposure to water run-off to name a few.
If you are running a commercial pool remember to ensure the staff is checking the chlorine on a daily basis. It is helpful to have a maintenance report on site showing the chemical levels and what was added each day to move them. I can’t remember at the moment if this is required by health code at all pools, but I know certain cities we provide pool service for including (pool service in Frisco, TX) and (pool service in Plano, TX) are enforcing or asking about the daily record keeping at least. As a rule we just provide a daily maintenance report to all our commercial pool customers for their maintenance staff to utilize even if we are not there every day.