CYA

[Tommygarry1]

Hi all - CYA at 80. New Salt cell. Cell working. However, pump on for 10 hours and chlorine still getting eaten up. Went from 4.5ppm to 3 in 3 days. 80 to 85 degree days and my pool temp ranges from 82 to 90. Is this just HIGH demand and maybe add a little supplemental Cal Hypo here and there and call it a day? I feel I always need my salt generator at 100% in the summer.

 

[proavia]

Perform an Overnight Chlorine Loss Test

 

[Tommygarry1]

Passed the OCLT. I guess even with CYA levels of 80 and a SWG on at 100% for 10 hours, a hot sun will do it's dirty work. Feels like it defeats the purpose of continuing to find old socks to add CYA. I read of others keeping their SWG at lower % due to having adequate CYA levels

 

[mknauss]

You need to run the pump longer.
I assume you have an Aquapure 1400 SWCG? It is not listed in your signature.
At your settings, 10 hours at 100%, you are adding 2.2 ppm FC per day. Not enough. I would add 5 hours to the pump run time and see if that keeps up.

 

[Tommygarry1]

I just updated my signature and you are correct. I have the 1400. 15 hours...wow. Ok. I did up it to 12. But you're saying that even with CYA at 80, I still need to run the pump for 15 hours at 100% SWG?

 

[mknauss]

That would add 3.3 ppm FC per day. Within reason for your area this time of year.

 

[sande005]

mknauss beat me to the post about your SWG and increasing the time.

See: The Free Chlorine and Cyanuric Acid Relationship

With CYA at 80, you should be running FC at 6-11. 4 is the bare minimum, and can dip into the algae zone really fast.
PoolMath calculates your SWG is currently only adding 2.2 ppm. Running the pump 24/7 would max it out at 5.5 ppm
Boost your FC using liquid up to the 11 ppm, and play with the pump time (SWG always at 100%) to find what amount keeps the FC at the 10-11 mark. Given the lowish max amount it can do in 24 hrs, you may find the pump has to run even longer than 15 hrs during high summer when Cl losses are the highest.
Others that run lower SWG %'s are using cells that are oversized for the pool - so they can cut back both on run time and %. Jandy says it is for up to 40,000 gal. - and is the biggest they have. But at only a rated 1.25 lb/day, it actually is on the smallish size for your gallons. It should keep up, but has to work more to do so.

My pool is 23,000. My RJ45+ nominally can do 2lbs of CL per day. Running 24/7, I can maintain at 40-45% (therefore making .85lb/day). But at only running 10 hrs, I'd have to be at 100%, and might slowly fall behind (making .82 lb/day). Your lb/day needs will be different, depending on a host of factors about your pool and climate.

 

[Jimrahbe]

Tommy,

Your SWCG is really too small for your pool. We always recommend that a SWCG be rated for at least 2 x the volume of the pool.

This is because SWCG's are rated when running 24 hours at 100% output.

A 30K pool should have a 60K cell.

Thanks,

Jim R.

 

[sande005]

Tommy,

Your SWCG is really too small for your pool. We always recommend that a SWCG be rated for at least 2 x the volume of the pool.

This is because SWCG's are rated when running 24 hours at 100% output.

A 30K pool should have a 60K cell.

Thanks,

Jim R.

He's kind of stuck - unless he wants to replace it with another brand, and then the search is on to find something that will integrate cost effectively with the Aqualink system.
Or he replaces the motor or whole pump with a variable speed, so he can reap the big electrical cost savings of running the pump on very low 24/7. But there is the Aqualink to consider, again.

The current should work, at the electrical cost of more run time for the single speed pump.