# Thread: How to calculate output from lbs to FC

1. ## How to calculate output from lbs to FC

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%...

2. ## Re: How to calculate output from lbs to FC

Ues effects of adding chemicals and choose chlorine gas.

3. ## Re: How to calculate output from lbs to FC

14 FC per day at 100% in a pool your size.

4. ## Re: How to calculate output from lbs to FC

Originally Posted by Richard320
14 FC per day at 100% in a pool your size.
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

5. ## Re: How to calculate output from lbs to FC

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".

6. ## Re: How to calculate output from lbs to FC

Originally Posted by chem geek
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".
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.

7. ## Re: How to calculate output from lbs to FC

Originally Posted by aussieta
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
Thanks---I just took this and calculated out the various percentages and made a chart to base numbers vs run times and cell settings!

8. ## Re: How to calculate output from lbs to FC

Why not convert lb to oz then divide by 24 to get oz/hour. Plug result in pool math to determine fc added to pool. Multiply by run time for total fc. Thats what I did and then made a quick reference chart.

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