Pump RPM vs accuracy of SWG salt ppm reading

[jmcmd1980]

I use my SWG reading as a rough estimate of how my pool salt level is doing. I noticed the reading varies with RPM speed. I run my pump between 1725 RPM and a prime speed of 3300 RPM, with some spa spill over at 2750.

Is there a? “more accurate” pump RPM level to obtain a salt level reading from the SWG?

Thanks!

Jim

 

[Jimrahbe]

Jim,

Every saltwater pool owner needs an accurate way to test the "Actual" salt reading of the pool water.. Often the "Reported" salt level can be way off.. It is more a ballpark measurement.

I would recommend the Taylor K-1766.. I just read you signature.. I did not know that the Taylor 2006 had a salt test...

Anyway... Test with a salt test kit and then see what speed gives you the most accurate reading..

I have never noticed where rpm has effected my salt readings, but we have different systems.

Thanks,

Jim R.

 

[JamesW]

I noticed the reading varies with RPM speed.

How much difference?

 

[JamesW]

K-2006-SALT

Complete™ kit for Chlorine, pH, Alkalinity, Hardness, CYA, Salt (FAS-DPD–high range) (.75 oz bottles)

 

[ajw22]

How much does the reading vary?

 

[JamesW]

 

[Jimrahbe]

I learn something new here every day.

Probably because there is plenty of empty room in my "storage area"...

I just had never seen it before.

Thanks,

Jim R.

 

[HermanTX]

Is there a? “more accurate” pump RPM level to obtain a salt level reading from the SWG?

I have the Jandy 1400 SWCG and iAquaLink. The sensor in the SWCG is just a calculation and not an actual measurement. I always used the K1766 kit to know my actual salt level. It is important that sensor is in its “happy zone” so it does not stop chlorine production.
I never took the time to measure the sensor reading vs actual salt reading.

I also have never seen a sensor measurement that was more accurate at a certain speed, although I never really took note of it. My pool ran more than 20 hours at a fixed speed and I do know the AquaLink salt readings were always up and down when I looked at the app. Sounds as it is pure randomness.

Also, when you need to purchase a new SWCG, be sure to get the package to replace the tri-sensor module.

 

[mas985]

Is there a? “more accurate” pump RPM level to obtain a salt level reading from the SWG?

I do not have the same chlorinator as you but with mine (T-15 AquaLogic), the salt ppm display remains the same reading independent of RPM as I have done this measurement. This is expected behavior as flow rate should not affect water conductivity which is what most SWG units use to determine salt level.

 

[JamesW]

For Aquarite, some people report that hump up produces a lower reading than hump down at lower flow rates.

This can be due to a buildup of gasses in the hump reducing the amount of plate surface area exposed to water.

For AquaPure, it might help to put the sensor down rather than up.

You can calibrate the AquaPure unit if necessary.

 

[JamesW]

 

[jmcmd1980]

How much difference?

It varies throughout the day between 3000 and 3400, usually lower readings at lower RPM’s. I check also with Taylor test and a calibrated salt meter which is pretty consistent between 3000 and 3200 depending on rain.

My SWG sensor at the bottom.

Thank’s everyone!

 

[ajw22]

I think that variance is immaterial and not a problem.