Calcium Hardness Question

tdub4

Member
Sep 13, 2007
22
Dallas, Texas
Surface
Plaster
Chlorine
Liquid Chlorine
My numbers are:
FC: 7.0
CC: 0
PH: 7.6
TA: 80
CH:230
CYA: 50

Based on this information, and using the Taylor Watergram, I am between -1 and 0 on balanced water. Seems as if I raise the CH to 275-280 this would get it more closely aligned to 0 and back in range (everything else is in range based on the TFP recommended levels for my pool - 16K gallons, plaster, liquid chlorine).

That being said, we have always fought with a white line at the water level around the tile of the pool which I assume is from calcium. Will increasing the CH also add to this as well?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
39,384
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
If the white line around your waterline is indeed from calcium scale, then the higher your calcium saturation index (CSI) rises, the more potential to see scale around the pool and some accessories. You don't show a water temp which is a critical factor in determining CSI in the PoolMath APP. I would encourage you to use that PoolMath APP tool for sure. Also update your profile location so we know the potential of hard water in your area (Az, CA, TX, NV, etc). That and any info you can place in your signature will help with replies.
 

tdub4

Member
Sep 13, 2007
22
Dallas, Texas
Surface
Plaster
Chlorine
Liquid Chlorine
Thanks. Updated signature with pool info and location. Currently, this morning, pool temp is 68, but has been running mid-70s in the day of late. I do have the pool app, but dont see where to enter the water temp on that. It also gave me an alert of my CH being too low.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
39,384
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
I do have the pool app, but dont see where to enter the water temp on that. It also gave me an alert of my CH being too low.
Look in your PoolMath settings to include CSI as a required item. That should enable a water temp field entry. Based on your numbers above, I suspect your CSI fluctuates around -0.2 +/- a few points which should help to prevent scale build-up. As your water temp increases this summer the CSI will rise closer to neutral (zero).
 

Rancho Cost-a-Lotta

Silver Supporter
TFP Guide
Apr 10, 2018
3,939
Rancho Cucamonga, CA
Pool Size
18375
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45
You'll see CH levels rise with top offs. When water evaporates, it leaves behind the calcium. More calcium-laden water is added from your fill water.

It's a good idea to test the CH of your fill water so you know what you're up against. If it's high, consider connecting the fill line to a softened source.
 
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