# Thread: SWG output, how's my math

1. ## SWG output, how's my math

According to Hayward my SWG can produce a maximum of 1.4 lbs of chlorine/day. So I did the math.....I think is correct.
1.4 lbs =22.4 oz a day(24 hours)
That's 0.933 oz per hour.
I run my pump at the moment for 10 hours a day at 1200 RPM (100 watts of power) turn over rate approx 3 times......yes I know that's probably over kill, but anyway. My output is set at 50%. Which means that the system will generate chlorine for 5 of the 10 hours.
That comes to 5 x 0.933 = 4.66 oz of chlorine. I f I plug that number into pool math I get 5 PPM of FC during my run time. My system seems to be maintaining ok. This gives me nice bench mark.

FC at 430PM hottest part of day =4.5ppm
TA = 125
PH = 7.4
CYA = 55 in progress of raising to 70
Salt = 3500
Water temp = 90F
CH = 250

2. ## Re: SWG output, how's my math

Your signature says a T-3 cell, but it is the T-15 that produces 1.4 lbs per day.

Your math is right, but I think you started with the wrong output. The T-3 is only 0.6 lbs per day ... which puts your daily addition at 2.1ppm FC each day which is more reasonable.

3. ## Re: SWG output, how's my math

Is there a relationship between flow rate and chlorine generation? That is, does the cell generate the same amount of chlorine at a pump speed of 1200 rpm as it would on the same system at, say, 1600 rpm?
Thanks,
Mike

4. ## Re: SWG output, how's my math

Originally Posted by Mike_W
Is there a relationship between flow rate and chlorine generation? That is, does the cell generate the same amount of chlorine at a pump speed of 1200 rpm as it would on the same system at, say, 1600 rpm?
Thanks,
Mike
No relationship. The SWG either has enough flow to generate or it does not and will not generate. The amount of FC produced is independent of the pump speed.

5. ## Re: SWG output, how's my math

Aw...yes you are right.......my cell is a T-3. Thanks for pointing that out. I need to re-do my math.

6. ## Re: SWG output, how's my math

Thanks for doing the math. I was wondering how to do the same thing and saw your post. Confirmed I was on the right track with my math

7. ## Re: SWG output, how's my math

Another thank you!
I now understand how that works and was able to do the math for what my SWG generator produces. You might have helped me solve my problem.

8. ## Re: SWG output, how's my math

Thanks . I hope this helps someone other than me. I was looking at setting a bench mark or reference for doing any additional adjustments. I know testing is still required but this shpuld keep me in the ballpark

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