IC40 - Measuring Chlorine Output

[FattyLumpkin]

Hey all, noticing a drop off in my IC40 output. It's roughly 5 years old. Have cleaned it regularly (1x per year, only if noticeable scaling). Question is: how do I tell for certain if it's failing? All my testing numbers are optimal (except now, FC) with TFP saltwater standards. Passed OCLT, so I don't think there's algae at play yet. Any help appreciated.

 

[Jimrahbe]

F,

Since you passed the OCLT, you can do what I call a reverse-OCLT..

Test your FC level right after sundown and then run your cell all night at 100%... Test again just before sunrise and any increase in your FC will be the amount the cell has produced..

In "theory" an IC40 in a 24K pool should produce an increase of .29 ppm per hour... or about 2.3 ppm in 8 hours.

If you get way less than that, and you have no scale, then I would suspect the cell is on the way out. You can try increasing your salt level and see if that helps temporarly...

Thanks,

Jim R.

 

[FattyLumpkin]

Thanks Jim.

The OCLT I passed must've been too long ago. I did the reverse OCLT, and over a 9 hour period last night, I actually *lost* 2.5 ppm. That's with the cell @ 100%. I was hoping to avoid a SLAM for now, as there's very nice weather (finally HOT) moving in tomorrow. But not sure it's avoidable seeing as there's definitely something getting a foothold. Thanks for your help.

 

[Jon in Albany]

Thanks Jim.

The OCLT I passed must've been too long ago. I did the reverse OCLT, and over a 9 hour period last night, I actually *lost* 2.5 ppm. That's with the cell @ 100%. I was hoping to avoid a SLAM for now, as there's very nice weather (finally HOT) moving in tomorrow. But not sure it's avoidable seeing as there's definitely something getting a foothold. Thanks for your help.

Someone please correct me if I'm wrong, but I thought if your pool looked pretty clean and could see the bottom, it was safe to swim during at appropriate slam levels.

Safe to swim during SLAM?

 

[Jimrahbe]

Thanks Jim.

The OCLT I passed must've been too long ago. I did the reverse OCLT, and over a 9 hour period last night, I actually *lost* 2.5 ppm. That's with the cell @ 100%. I was hoping to avoid a SLAM for now, as there's very nice weather (finally HOT) moving in tomorrow. But not sure it's avoidable seeing as there's definitely something getting a foothold. Thanks for your help.

F,

If your water is clear, I suspect jacking the FC up to SLAM level for a day or so will take care of it...

Thanks,

Jim R.

 

[FattyLumpkin]

I always understood it as "FC up to SLAM level", but not at or above.

Someone please correct me if I'm wrong, but I thought if your pool looked pretty clean and could see the bottom, it was safe to swim during at appropriate slam levels.

Safe to swim during SLAM?

 

[FattyLumpkin]

Water clear, going to hit it hard starting tonight and hopefully can get it leveled off so I can actually test my cell's output soon. Thanks again.

F,

If your water is clear, I suspect jacking the FC up to SLAM level for a day or so will take care of it...

Thanks,

Jim R.

 

[Jon in Albany]

I always understood it as "FC up to SLAM level", but not at or above.

I just reread it and I think you are correct.