SWG help

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T

truck981

New member
Mar 30, 2023
4
Austin, TX
Pool Size
25000
Surface
Plaster
Chlorine
Salt Water Generator
I’m running my SWG and can’t get keep the chlorine above 1ppm, even when I run super chlorinate. Chemistry is generally good but have high Calcium Hardness at around 700ppm (hard water, replacing the water slowly). Not sure what I’m doing but I can’t see how the chlorine is getting eaten so quickly if it is being produced.

TA 75
FC 1
CC 0
PH 7.8
CYA 50
CH 700
Salt 3650
Water temp 80
Borates 25

Cell is cleaned

Thanks in advance for help
 

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Jimrahbe said:
981,

How large is your pool in gallons?

How large a pool is your cell rated for??

How many hours a day is the cell running??

Thanks,

Jim R.
Click to expand...
It’s around 25k gallons

Hayward S340 - rates at 40k gallons

I run it usually around 10 ours a day at 85% with pump on high for about 8 hours during the hottest part of the day. Also tried running it at 24 hours with minimal results.

Thanks again.
 
truck981 said:
It’s around 25k gallons

Hayward S340 - rates at 40k gallons

I run it usually around 10 ours a day at 85% with pump on high for about 8 hours during the hottest part of the day. Also tried running it at 24 hours with minimal results.

Thanks again.
Click to expand...
I’ll note that I did slam it a couple weeks back and the chlorine seemed to keep for about a week - might be that I need to adjust the pump and SWG setting. Texas heat is a killer - even in spring and getting shade in the pool past 4.
 
981,

Here are some things to think about...

Your cell will produce about 6.7 ppm of FC when run for 24 hours at 100%.. The is .28 ppm per hour at 100%

10 hours of run time = 2.8 ppm per day at 100% and about 2.4 ppm at 85%

Most pools use 2 to 4 ppm per day, with Texas being at the higher end..

How sure are you that your CYA is really 50 ppm? I ask because for me, when I see FC consumption going up, my CYA almost always has gone down. We recommend a CYA of about 70 ppm for saltwater pools.

You certainly may still have some algae, if you did not complete all the SLAM steps...

That said, running 10 Hours a day, in Texas with a CYA of 50 (or less) is not really giving the SWCG a chance to catch up.

If this were my pool, I'd run an Overnight Chlorine loss test.. (OCLT) Overnight Chlorine Loss Test

If you fail the OCLT then you need to go back and complete the SLAM.. If you pass the OCLT, then I'd dump in enough Liquid Chlorine to get your FC up. Add a little CYA to get up to 70 and Then start running your pump longer.

There is just no reason to run the pump "on high" to make chlorine.. The SWCG makes the same amount of chlorine anytime it is on.

Also.. I suggest that you never try to keep your FC between your Minimum FC and your Target FC.. I keep my FC at, or above my FC Target.. For me that is 5 to 10 ppm.. See this chart.

FC/CYA Levels

Thanks,

Jim R.
 
Jimrahbe said:
981,

Here are some things to think about...

Your cell will produce about 6.7 ppm of FC when run for 24 hours at 100%.. The is .28 ppm per hour at 100%

10 hours of run time = 2.8 ppm per day at 100% and about 2.4 ppm at 85%

Most pools use 2 to 4 ppm per day, with Texas being at the higher end..

How sure are you that your CYA is really 50 ppm? I ask because for me, when I see FC consumption going up, my CYA almost always has gone down. We recommend a CYA of about 70 ppm for saltwater pools.

You certainly may still have some algae, if you did not complete all the SLAM steps...

That said, running 10 Hours a day, in Texas with a CYA of 50 (or less) is not really giving the SWCG a chance to catch up.

If this were my pool, I'd run an Overnight Chlorine loss test.. (OCLT) Overnight Chlorine Loss Test

If you fail the OCLT then you need to go back and complete the SLAM.. If you pass the OCLT, then I'd dump in enough Liquid Chlorine to get your FC up. Add a little CYA to get up to 70 and Then start running your pump longer.

There is just no reason to run the pump "on high" to make chlorine.. The SWCG makes the same amount of chlorine anytime it is on.

Also.. I suggest that you never try to keep your FC between your Minimum FC and your Target FC.. I keep my FC at, or above my FC Target.. For me that is 5 to 10 ppm.. See this chart.

FC/CYA Levels

Thanks,

Jim R.
Click to expand...
Thank you!

I think I’m going to try and clean everything out, maybe try and drop the CH by replacing water, level the CYA (I had to increase - it dropped to 0 over the winter somehow) then SLAM with liquid chlorine and readjust the SWG.

One thing I didn’t realize is that the chlorine output is not dependent on pump speed - so may just run it more at a lower speed.

Dimitris
 
Dimitris,

I run my 3 HP IntelliFlo pump 24/7, mostly at 1200 rpm.. This is plenty of flow to turn on the cell and to skim well.. To do this costs me less than $20 bucks a month. I like making a little chlorine all the time, and skimming all the time. I also do not like my pool when it looks 'dead'.. I like to see a little motion to the water.

I actually think it is better for the pump to run 24/7, than turning it on and off every day... I've been doing this for well over 12 years.. At 1200 rpm, my pump is so quiet, you almost have to touch it to make sure it is still running.. :mrgreen:

I have a large cartridge filter and no heater, so I can run pretty slow..

No matter what speed turns on your SWCG, long and slow is much better than short and fast.

Thanks,

Jim R.
 
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