Running time for SWG

[FloridaRes]

Hi all,

I have a PureChlor SWG, with a timer on the panel. I have currently set it to run for app 8 hours (the pump runs for 10 hours a day at 10m3 per hour, the pool is 38m3 or 10k gal). There is 3500 ppm salt in the pool.

I cannot find any instruction on how long time the SWG should run for. The setting is at 6 out of 8 on the SWG. I "feel" that there is enough FC (i.e. I can barely smell it on my skin), and my titration test shows app. 3-4 ppm.

Another question: can you test the amount of stabilizer by analyzing the free chlorine right after the SWG shuts off (e.g. at 6 pm) and then again just before it turns on (e.g. 11 am) the next day. If the reading shows the same, and the SWG hasn't been on in those 16 hours, this must mean that there is enough stabilizer. Am I right?
Thanks!

 

[dfwnoob]

You need to test the amount of CYA (stabilizer) with a proper kit. There is no other way. Without knowing your CYA, you really can't determine how long to run the SWG because you don't know what you're targeting.

You'll need either a Taylor K2006-C or a TFTestKits.net TF-100/TF-Pro.

 

[pjt]

I cannot find any instruction on how long time the SWG should run for.

There's a SWG calculator in the Pool Math app. Go to "Effects of Adding" --> "Chemical Additions" --> "SWG".

my titration test shows app. 3-4 ppm

What model test kit do you have?

can you test the amount of stabilizer by analyzing the free chlorine right after the SWG shuts off (e.g. at 6 pm) and then again just before it turns on (e.g. 11 am) the next day. If the reading shows the same, and the SWG hasn't been on in those 16 hours, this must mean that there is enough stabilizer. Am I right?

No. Even with an appropriate amount of stabilizer, the sun's UV will deplete your FC. Average daily FC loss is 3-4. You need a proper CYA test to measure the CYA level.