More important: Keeping chemistry in range or CSI in range?

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kstough

kstough

Active member
Jun 7, 2019
43
Ozark, AL
Is it more important to keep water chemistry values in the target ranges, or is it better to keep CSI balanced?

I attached my current water results for your review. And although everything but TA and CYA are in range, my CSI shows it’s at a corrosive level. And when I play with the calculator and move my TA and CYA to be in range, it actually make the corrosiveness level worse. It shows that I would have to bring my CH up to 250 to even get my CSI in an ok range while also keeping my water chem levels in range as well.

Not sure if I need to stick to the water chem ranges or let some of those ranges slip higher or lower to get CSI in range...Or go with adding tons of calcium so they both stay within range.

Thanks for the help!
 

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Plcae your focus on the recommended levels. With a vinyl pool, the (low) CSI doesn't really apply to your pool since there is no plaster to be concerned with. Now if your CSI was exceptionally high, then yes, you would be worried about scale. But a low CSI - no worries. :)
 
Ok will do. One more question. Why is the TA recommended to be lower in SWG vs chlorine pools? Because of the metal ladder, step rails, and my Dolphin robot, I'm gonna still keep an eye on my CSI a bit (although not being super anal b/c I have vinyl). It looks like if I lower my TA to 80 as recommended, the CSI calculator shows it would drop to corrosion levels. Just wondering if it would be bad to leave my TA at 100 even though I have a SWG and the recommended TA levels are 60-80 vs 50-90+ is chlorine pools.
 
Are your robot, metal ladder, and steps made from a calcium based material? That is what a negative CSI is corrosive to, not metals, etc.

Keep your pH in the 7's. The TA will settle were it does, and do not worry about CH, unless for some reason it rises above 350 ppm.
 
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Up on the soap box again.......A pool in Alabama will have virtually no use for CSI. For that matter, I believe the majority of pools in the US have no use for it, either.

High CH fill water (and some other issues) is when CSI gets important and, unfortunately, the desert Southwest, some parts of Texas and California are where this troublesome condition is found.

We Lucky ones in the North, Northeast and most of the Southeast do not have these conditions

I also might mention that with the glaring exception of Texas A&M, we have the better football teams, too! Gig 'em !
 
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