CSI impacts on SWG with vinyl pool

jgofnj

Silver Supporter
May 28, 2013
214
Hillsborough, NJ
After about 15 years of using liquid chlorine, I finally got a IC-40 SWG and already love it! Now that I have a SWG I want to make sure I prolong the life of the cell plates.

Can I assume that since the CSI is in the negative range and because I have a vinyl liner, I don't need to be concerned with the cell plates on the SWG? Only if the CSI was in the high positive range would I need to be concerned.
  • I have never been concerned with CSI because I have a vinyl liner and always had a high negative index due to having low CH levels (I do not add CH) and current levels are in the 40 - 50 range.
  • I already maintain the proper levels according to the TFP recommendations.
 

Leebo

Admin
TFP Expert
LifeTime Supporter
Jul 21, 2011
11,023
Eastern Ohio
Pool Size
25000
Surface
Vinyl
Chlorine
Liquid Chlorine
The main concern with CSI and a salt water generator is going to be calcium scale on the cells. Seeing your calcium level is rather low this isn't a large concern for yourself. Continue to maintain the pool as you were and enjoy the reduced workload. Just don't forget to bump your CYA level up somewhat next Summer. :)
 
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jgofnj

Silver Supporter
May 28, 2013
214
Hillsborough, NJ
The main concern with CSI and a salt water generator is going to be calcium scale on the cells. Seeing your calcium level is rather low this isn't a large concern for yourself. Continue to maintain the pool as you were and enjoy the reduced workload. Just don't forget to bump your CYA level up somewhat next Summer. :)
Thanks! That is my plan. I will be closing my pool in a few weeks up here in the NJ. When I open in the Spring, I will bump up the CYA to 70.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
29,060
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Can I assume that since the CSI is in the negative range and because I have a vinyl liner, I don't need to be concerned with the cell plates on the SWG? Only if the CSI was in the high positive range would I need to be concerned.

With your TA and CH you should be fine.

But no, you cannot assume that simply because your CSI is in the negative range you will not get scale on the SWG plates. The problem is, INSIDE the cell, the CSI is very different than in bulk pool water.

Read TA - Further Reading
 
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Oly

Gold Supporter
Jun 28, 2017
2,339
Fresno, CA
Pool Size
27000
Lowering my TA ftom 70 to 50 and my pH from 7.8 to 7.4 made a significant reduction in scale accumulation on my cell plates.
 
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jgofnj

Silver Supporter
May 28, 2013
214
Hillsborough, NJ
With your TA and CH you should be fine.

But no, you cannot assume that simply because your CSI is in the negative range you will not get scale on the SWG plates. The problem is, INSIDE the cell, the CSI is very different than in bulk pool water.

Read TA - Further Reading
Thanks, will take note and read the link. My TA is generally on the lower end of the range, but I will keep an eye on it.
 

markayash

Gold Supporter
Mar 21, 2016
3,546
Atlanta Ga
You may withdrawals for a few months. Takes a while to get use to realizing the FC is the same today and it was 2 months ago and your not needed as much 🤣
 
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