The Circupool brochure that came with my SWG says it (SI-45+) can output up to 2.1lbs of CL per day...how do I translate that to determine what the expected FC input per day? I'm also assuming that's with the device at 100%...
14 FC per day at 100% in a pool your size.
Note that that will only work for certain chemicals, such as chlorine gas, salt and pure cyanuric acid. It won't work for other types of chlorine, bicarb, calcium chloride, boric acid etc.You could also type into a regular Google search "2.1 pounds per 17400 gallons in milligrams per liter" and you will get "14.4618102 milligrams per liter".
or 0.58ppm per hour at 100%
bring fc up to 3ppm with bleach or similar
then i would start at 5 hours run time at 100%
measure daily and adjust every third day until you find the level your pool likes