Are the recommended Calcium Hardness levels higher now?

Skenn81

Well-known member
Apr 23, 2018
145
Florida
Doing my first full panel in a while and when I went to the new Recommended Levels interactive page ( What Are My Ideal Pool Levels? - Trouble Free Pool ) I saw the CH figures are recommending 350-550. Normally I pick a middle point so I would need to bring my CH up to 450. Have I not been paying attention or has it always been this high? Thats 302 oz (280->450, 15,000gals) that I need to go mix in today.
 

Leebo

Admin
TFP Expert
LifeTime Supporter
Jul 21, 2011
9,944
Eastern Ohio
They were altered this Winter as we've found users could control scale well above the levels we were suggesting before. That said, there's also no need to rush out and add calcium. As long as your levels are within the Recommended levels........you're fine.
 

Skenn81

Well-known member
Apr 23, 2018
145
Florida
The problem is now my level is in the minimum range as opposed to the new higher ideal one. I figured I should bring them up to that for now.
 

BowserB

Silver Supporter
Jul 29, 2018
334
Katy, Texas
This may be news worth passing on. I've used the card that came with my TF100 test kit, and its recommended 250-400 range. I'd be interested to know what advantage one would see for a pool from a 100ppm higher calcium hardness range and what the downside of that increased calcium level might be. I also wonder what implications that has for other levels: pH, Total alkalinity, for example?

Where I live, calcium and magnesium in the water is a real problem for water heaters, appliances like dishwashers, washing machines, plumbing fixtures, and plumbing generally. We use a water softener with potassium chloride to take out calcium. Inconveniently, our pool autofill also is adding softened water, so I have had to add calcium--and now that I've said that, I even wonder what increased potassium from the water softener in the pool water means to overall pool chemistry. Every answer generates a new question, eh?
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
23,923
San Dimas, CA (LA County)
Doing my first full panel in a while and when I went to the new Recommended Levels interactive page ( What Are My Ideal Pool Levels? - Trouble Free Pool ) I saw the CH figures are recommending 350-550. Normally I pick a middle point so I would need to bring my CH up to 450. Have I not been paying attention or has it always been this high? Thats 302 oz (280->450, 15,000gals) that I need to go mix in today.
Plug all your numbers in and see what the CSI works out to. If you're outside the safe zone (+/- 0.3) do something. If you're okay, change the target to the current and you're all balanced without adding a thing.
 

Leebo

Admin
TFP Expert
LifeTime Supporter
Jul 21, 2011
9,944
Eastern Ohio
The problem is now my level is in the minimum range as opposed to the new higher ideal one. I figured I should bring them up to that for now.
Keep in mind TFP takes all things and all areas into consideration with these levels. In your case it’s likely that your pool never gets that cold. In the north-East however pools easily see temps where the water is in the 60’s or lower. In that case the extra calcium helps protect the surface of the pool. Post a full set of results and we’ll help make you a game plan on what’s best for your personal pool. 👍
 
  • Like
Reactions: markayash

Skenn81

Well-known member
Apr 23, 2018
145
Florida
This month the readings are
CL: 9 (bring it up to that daily now)
CYA: 50 (finally got it back up)
Ph: 7.6
TA: 70
CH: 280 - But I added 148oz of calcium hardness stuff so I will need to test that again today or tomorrow to see what the result is. The calculator says this should have brought up to to around 350.

Says my CSI is at -.02

CH at 280 shows a CSI of -.12 so I have to make sure I keep it higher.
 

markayash

Gold Supporter
Mar 21, 2016
2,409
Marietta Ga
Keep in mind TFP takes all things and all areas into consideration with these levels. In your case it’s likely that your pool never gets that cold. In the north-East however pools easily see temps where the water is in the 60’s or lower. In that case the extra calcium helps protect the surface of the pool. Post a full set of results and we’ll help make you a game plan on what’s best for your personal pool. 👍
Thanks, I wondered that also. My temp is 75 and my CH is 350. Was going to add more but the price on Amazon jumped 25% in a month