SWG or Peristaltic Pump and bleach?

[JasonLion]

On the Pool Calculator you use chlorine gas any time you are going from an SWG cell rating. If the capacity of the cell is stated at all, it will be in the same units that chlorine gas is measured in.

 

[chem geek]

Using "The Pool Calculator" is the chlorine setting for "chlorine gas" what you would use for SWG calcs?

It is if you know the "weight of chlorine gas per day" output rate from your SWG. You could then roughly figure out the necessary on-time and from that and the pump runtime you can figure the SWG on-time percentage. Of course, ultimately, you'll tweak with trial and error.

Let's say, for example, that your SWG is rated at 1.5 pounds of chlorine gas per day. Let's say you have a 20,000 gallon pool and your daily chlorine demand is 2 ppm FC per day. The Pool Calculator then says to get this FC you need 5.3 ounces weight of chlorine gas. So that means the SWG needs to be on for 24*5.3/(16*1.5) = 5.3 hours. If your pump runtime is 8 hours, then your SWG on-time percentage needs to be 5.3/8 = 66%.