CSI opinion

[MarkHoop]

Hi Folks,

Just looking for an opinion on my current CSI. My PM numbers look good and the pool is probably a little cooler than typical but the CSI seems low which would indicate corrosive?

Vinyl, SWG and Heater

Thanks

 

[mknauss]

You have no reason to be concerned about CSI unless your CH is very high, above 500 ppm.

Turn off tracking CSI in the App settings.

 

[PoolStored]

CSI is used in plaster pools, SWCG, and heaters.

Pool heat exchangers are damaged by low pH or high saturation index causing scaling in the heat exchanger.

 

[MarkHoop]

You have no reason to be concerned about CSI unless your CH is very high, above 500 ppm.

Turn off tracking CSI in the App settings.

Why is CSI not important in my situation?

 

[mknauss]

You have a vinyl pool. Low (negative) CSI is only applicable to plaster pools or other cement based items in constant contact with the pool water. High CSI (above 0.3) is a concern for a SWCG.

 

[MarkHoop]

And low CSI is considered corrosive is it not? So why is that not an issue for a heater?

 

[mknauss]

Corrosive to cement based products. Your heater has no cement in it.

'Corrosive' is a poor description. Very low CSI for a long time can leach calcium from a calcium based product.

 

[MarkHoop]

Corrosive to cement based products. Your heater has no cement in it.

'Corrosive' is a poor description. Very low CSI for a long time can leach calcium from a calcium based product.

Ahh, agreed...as a metallurgist corrosive = BAD

So as long as my pool is properly balanced then I really have no need to track CSI as you have suggested for a vinyl pool?

 

[Texas Splash]

One of our plaster experts used to say he preferred using the term "aggressive" when it related to water and plaster (i.e. low CSI), but then used "corrosive" when it related to metal components (low pH). We try to apply the correct feedback based on a member's question.

 

[PoolStored]

So as long as my pool is properly balanced then I really have no need to track CSI as you have suggested for a vinyl pool?

Marty can answer too.

Having a negative CSI will help keep the SWCG plates clean. Running the way you do, shouldn't be a problem.

Keep your pH at or above 7.6 to avoid corrosion of the heat exchanger. Low pH does the damage.

 

[JamesW]

Elemental copper develops a patina of copper oxide, which protects the copper from further oxidation.

Low pH is what strips off the copper oxide and exposes the elemental copper to oxidation from chlorine and oxygen.

 

[MarkHoop]

Marty can answer too.

Having a negative CSI will help keep the SWCG plates clean. Running the way you do, shouldn't be a problem.

Keep your pH at or above to avoid corrosion of the heat exchanger. Low pH does the damage.

Appreciate you all in taking the time to settle the science side of my brain!!!

Much

 

[PoolStored]

Sorry, forgot the 7.6 in my last post...