CSI info needed

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S

Slinky

0
In The Industry
Jun 2, 2018
3
Cottonwood AZ.
2 Questions concerning CSI:

1. Calculating CSI of pool water using one of the online calculators such as POOLPAL or POOLCALCULATOR.com

Both of the Calculators have an entry for SALT ....are you suppose to enter the "salt" ppm of the water ....or the total TDS ppm.
which would include the salt content of the water.

It's my understanding that the CSI equation calls for TDS ppm value.
So I thought the calculators would call for the TDS value ...not Salt. Confused.

My pool is a fresh water pool ...not a salt water pool.


2. Reading about CSI .....Aquatics International Article ..... says that you must be within the parameters of each of the values
for the CSI result not to be severely compromised. I understood all the values parameters except TDS. They are wide ranging.
But the author stated that the Parameter of the TDS for the CSI is 10 - 1000 ppm TDS.
That once the TDS exceeds 1000 ppm you are outside the parameter.
Is this correct ?
 
Thank you for replying. I read the pool school CSI and I do understand.
But I still do not understand what to enter on the CSI calculator where it has enter the Salt value. Enter the actual Salt ppm or the TDS ppm ?
Can you recommend a good online CSI calculator ? Do you use an online CSI calculator ?
 
You use Salt. TDS is meaningless in pools.

Use the CSI calculation in PoolMath. Enter your data in Now column. The CSI is calculated for you.
 
Thank you again for your reply.
I was hoping for a little more specific info on my original question .... Especially question #2.
Is there any CSI kinda geek out there that might pipe in with more specifics for me.
I actually get CSI pretty well....but really need a master to answer my 2 original questions in this thread.
I really appreciate the reply I've gotten...but just looking for more specifics.
Thank you.
 
We do not look at TDS ... it is an antiquated parameter that was used prior to better tests becoming available. Now we can test for the individual components that are more meaningful (CH, salt, CYA, etc).

the logic you stated in #2 makes no sense, any SWG pool (and really perhaps all pools) would have a TDS > 1000 and thus be outside the parameters.

Not sure what you are trying to accomplish here.
Is there a reason you are fixated on this?
 
Slinky said:
Thank you again for your reply.
I was hoping for a little more specific info on my original question .... Especially question #2.
Is there any CSI kinda geek out there that might pipe in with more specifics for me.
I actually get CSI pretty well....but really need a master to answer my 2 original questions in this thread.
I really appreciate the reply I've gotten...but just looking for more specifics.
Thank you.
Click to expand...

For pools, tds and salinity are basically the same thing.

The only time it might be relevant would be if you could establish that the TDS was not almost completely salt.

For example, if you tested for salinity using the K-1766 salt test and compared it to a conductivity salt test and the conductivity test was way higher than could be accounted for with the other known components of TDS, like calcium etc.

That would indicate that some unknown solid was in the water that may or may not be a problem.

If someone is using a dual meter like the Myron L Poolmeter and they set it to TDS, they are using it incorrectly because the TDS setting is for use when a different TDS mix is used.

PoolMeter™
 
I have read that above 1200 ppm TDS the Calcite Saturation Index no longer accurately predicts the aggressive/scaling tendency of pool water as well, and have always been unclear as to how that relates to reality, when 1200 ppm salt can build up rapidly (in a volatile pool with a lot of co2 loss) from reacting your carbonate alkalinity with HCL? Certainly someone can make sense of this? What about pools with salt generators, starting with NaCl concentrations between three and four thousand ppm at startup?
 

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Pool Math, yes. But at what level of TDS does the CSI become an unreliable indicator of aggressive water behavior, I suppose is my true question. I have the ability to track my salt and TDS concentrations, I use both the SGS SLTD and the Myron, and am simply looking for best practice type information, at what point is it necessary to drain/dilute based simply upon salt/TDS concentration? Chem Geek?
 
If you would like to discuss with ChemGeek, you would need to message him directly.

I am not sure how many more ways we can say that TDS is a meaningless parameter. There is no need to drain based on salt or TDS. There is only a need to drain if your CH or CYA (both of which are part of TDS) get too high to manage the chlorine or CSI respectively.
 
Crokey said:
Pool Math, yes. But at what level of TDS does the CSI become an unreliable indicator of aggressive water behavior, I suppose is my true question. I have the ability to track my salt and TDS concentrations, I use both the SGS SLTD and the Myron, and am simply looking for best practice type information, at what point is it necessary to drain/dilute based simply upon salt/TDS concentration? Chem Geek?
Click to expand...

What are you getting for salinity and TDS and how are you measuring them?

Are you using the TDS setting on a Myron L pool meter?
 
Jamesw- Just received my Myron L Ultra pen pt1 to complement the SGS SLTD 100, was curious as to my lower levels of salt, so my most current numbers are from the SGS. I am still in the bell end of the learning curve on the Myron, the documentation is sparse. ;-) But in the course of the day I can see salt/TDS readings of 590/700 all the way up to 6600/7200, in different vessels of course. These are my two outliers, most of my water is 1000 ppm NACL or less, so I was simply looking for guidance.
 
Most tap water will be close or above 1200 TDS, so anybody making a system to measure the aggressiveness of water that needs to be under 1200 TDS sounds like a bad idea.

I suggest you follow the tfp concept of csi and TDS and abandon all other sources of csi or lsi and articles about csi or lsi.
 
Crokey said:
Jamesw- Just received my Myron L Ultra pen pt1 to complement the SGS SLTD 100, was curious as to my lower levels of salt, so my most current numbers are from the SGS. I am still in the bell end of the learning curve on the Myron, the documentation is sparse. ;-) But in the course of the day I can see salt/TDS readings of 590/700 all the way up to 6600/7200, in different vessels of course. These are my two outliers, most of my water is 1000 ppm NACL or less, so I was simply looking for guidance.
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