If Calcite Saturation Index in correct range, does PH matter so much?

Docpatel

Active member
Oct 25, 2020
28
Denton, TX
PoolExperts, could use your insight for a question I have:

My calcite saturation index is within acceptable range @ .16 <--- used app.poolcalculator.com

My question is this: CSI/LSI is .16, which is acceptable. BUT, my PH is high @ 8.0 (or slightly above 8.0) based on the Taylor K-2006 44 ml test kit. So does Ph matter if LSI/CSI is acceptable? I plan to user some muriatic acid today to slightly reduce the Ph back down to 7.8 but wanted to know how picky I need to be based on whats really accepable.

Here are my current readings:
Water temp: 48
Ph: 8.0, maybe 8.2
Alk: 95
Calcium: 360
CYA: 90

Yes I know some of these are out of whack.... For example, I prefer CYA to be lower but plan to change some of the water come Spring when I convert to a Salt Water system.

Thanks in advance everyone!
 

mknauss

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May 3, 2014
36,082
Laughlin, NV
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A pH of 8 or so is not harmful to any pool system if CSI is within range. It can present a problem with a SWCG as scale can form on the SWCG plates if pH and TA are high, regardless of CSI. But that is an unusual circumstance.

You do not show what your FC is. Remember that a FC of 10 ppm or higher can effect pH test results. And with your high CYA, your Target Level FC is near or above 10 ppm.

Your TA of 95 is not measurable with your kit. It is tested in factors of 10. So I assume your TA is 100.
 

Docpatel

Active member
Oct 25, 2020
28
Denton, TX
Thank you!

Today FC is ~3.0. Combined < .2. I haven't been using high levels of chlorine even though CYA is high, which might lead to issues I'm unaware of.

You're right on TA of 100...the color changes only slightly more red at the 10th drop so I put it @ 95...I'll start recording those as 100.

The pool is 3 months new (plaster). I read somewhere to NOT let it fall / empty below the tile level or it'll start leaving lines on the plaster....I don't know if id' see lines on the pebble-like plaster but didn't want to take a chance.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
36,082
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
That is very low FC with that CYA. You might get away with it when the water is cold. But once the water temperature gets close to 60F, I would get the FC level up or be prepared for algae.
 
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proavia

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TFP Guide
Feb 6, 2015
2,090
Chandler AZ
Pool Size
12300
Surface
Plaster
Chlorine
Liquid Chlorine
Suggest you also use PoolMath instead of poolcalculator. PoolMath is maintained by TFP - poolcalculator may or may not be maintained/accurate. You can use either the app (click link above) or the old PoolMath page (see bottom of most forum pages for Old PoolMath Webpage).
 

Docpatel

Active member
Oct 25, 2020
28
Denton, TX
Suggest you also use PoolMath instead of poolcalculator. PoolMath is maintained by TFP - poolcalculator may or may not be maintained/accurate. You can use either the app (click link above) or the old PoolMath page (see bottom of most forum pages for Old PoolMath Webpage).

Ahh! I see it...thanks! I like the poolmath version better already. Didn't know there was a website version.
 

Docpatel

Active member
Oct 25, 2020
28
Denton, TX
Suggest you also use PoolMath instead of poolcalculator. PoolMath is maintained by TFP - poolcalculator may or may not be maintained/accurate. You can use either the app (click link above) or the old PoolMath page (see bottom of most forum pages for Old PoolMath Webpage).

@proavia I have a chlorine pool...not saltwater....the website had default value of 1000....is that supposed to be adjusted down to 0?
 

Leebo

Admin
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Jul 21, 2011
10,382
Eastern Ohio
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@proavia I have a chlorine pool...not saltwater....the website had default value of 1000....is that supposed to be adjusted down to 0?

You will ALWAYS have salt in the water if you’re using chlorine of any type. Because of this fact we’ve set a default salt level at a “best guess” level of 1,000ppm. You can override this level and insert a zero level for salt, but it likely won’t be as accurate.
 
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Docpatel

Active member
Oct 25, 2020
28
Denton, TX
You will ALWAYS have salt in the water if you’re using chlorine of any type. Because of this fact we’ve set a default salt level at a “best guess” level of 1,000ppm. You can override this level and insert a zero level for salt, but it likely won’t be as accurate.
Great to know. Thank you! Love this site.
 

Oly

Gold Supporter
Jun 28, 2017
1,733
Fresno, CA
Pool Size
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Get a salt test you might be amazed, I was. My liquid chlorine treated pool tested 4700 ppm after 3 years of a drain and fresh fill.
 
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