SWG Run Time Calculator

ctrav

Gold Supporter
TFP Guide
Apr 23, 2017
2,400
Northlake TX
Test the FC then wait and test again the next day around the same time. Thats how I did it over three days. Once the weather gets warmer and stays hot the FC demand will increase (at least mine does from the heat). I lose about 1 per day right now....
 

lightmaster

TFP Guide
Jun 22, 2017
801
Baxley, GA
For me, when I took off my cover after winter, my FC was still around 12 iirc, so I had to wait several days as it declined towards my target and knew how much it lost per day. Now I just bump the % up little by little as it gets hotter outside.
 

djw

Gold Supporter
Apr 17, 2010
131
Colleyville, TX
This great calculator proves what I've always suspected and noticed: with a large-ish 40K pool dead in the Texas summer, I need *two* Hayward T-CELL-15 sized generators to keep up when running a 8-12 hour cycle. But I have one and have to augment chlorine in the summer or run the pump basically 22 hours/day.

I've never heard of anyone running two generators on one pool but I suppose it's not out of the question. I don't see why the could not be run in series.
 

jblizzle

Mod Squad
TFP Expert
LifeTime Supporter
May 19, 2010
43,238
Tucson, AZ
There are a few SWG bigger than the t15, but not from Hayward.

Well actually they do have some for commercial but they are very expensive and very large
 

lightmaster

TFP Guide
Jun 22, 2017
801
Baxley, GA
This great calculator proves what I've always suspected and noticed: with a large-ish 40K pool dead in the Texas summer, I need *two* Hayward T-CELL-15 sized generators to keep up when running a 8-12 hour cycle. But I have one and have to augment chlorine in the summer or run the pump basically 22 hours/day.

I've never heard of anyone running two generators on one pool but I suppose it's not out of the question.
Not sure which would be better cost wise, to get a second SWG or just buy a larger one by a different brand. (On mobile and out and about, I'll look up prices when I get home). Also not sure if you have to have Hayward brand for automation or anything. Can you add a signature with your pool info?

If you do get a second Hayward, you should be able to run them in 2 lines running parallel to each other.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
33,978
Laughlin, NV
No difference chemically.

Your SWCG should be on timer as you do not have automation. It must never be possible to be powered on when the pump is not running.
 

Rrebel

Member
May 30, 2018
18
Aruba
Thanks mknaus, I have all of my pool equipment controlled by my home automation system. I cant run my SWG without my pump but i can run my pump without my SWG..
 

lightmaster

TFP Guide
Jun 22, 2017
801
Baxley, GA
Would it be best to run the SWG 100% 4 hours or 50% 8 hours for example?
i can control my SWG and Pump separate.
If the pump is run at the same speed for both 4 hours and 8 hours, the 8 hours option will use more power, so higher electric bill. If you slow the pump down for the 8 hour option, then won’t make much difference. As far as the lifespan of your SWG cell, they are both considered 4 hours of its life gone per day.
 

rhawke

Bronze Supporter
Nov 27, 2017
221
Houston, TX
Thanks for this great tool! I had built something like this myself but much more basic and then found this! While the biggest issue is getting the "correct" 24 hour FC demand as this will change daily, it is a very helpful tool to understand how run time and percentage will affect ppm generation. I have been trying to get mine dialed in since the pool started about 2 months ago, but with recent 3 weeks of 100 degree temperatures with no rain followed by 2 weeks of 80 degrees with daily rain where I had to drain the pool by 2 inches already 3 times, I have been having to make adjustments every week.
 

Effers

Bronze Supporter
Apr 27, 2012
65
Warrenton, VA
Great calculator!!!! However now I am scratching my head. Installed the Jandy SWG last month. According to the calc, if my 24hr FC demand is 2.0 and I want to run my pump 24 hrs per day, I should set at 23% (in most cases). Is that right? Thanks
 
Last edited: