Calcium Hardiness rising

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Fugazi

Well-known member
Apr 9, 2015
80
Saint Augustine Fl
My pool was last resurfaced on 11/30/2017

My calcium level was 375 on 9/30/2018 so I drained a little 3rd if the pool and added city water

The calcium dropped to 300

Now it’s 11/4 and my calcium is rising again to 350

Is this normal?

Should I wait till it goes above 350 to drain and refill to lower CH?

My pool does have some scaling and I’m trying to prevent it getting worse...
 
What are you using to chlorinate? What is the CH of your fill water? Are you adding fill water on a regular basis?

Do you monitor your CSI? See PoolMath for the CSI calculation based on your test data.
 
mknauss said:
What are you using to chlorinate? What is the CH of your fill water? Are you adding fill water on a regular basis?


Do you monitor your CSI? See PoolMath for the CSI calculation based on your test data.
Click to expand...

Using liquid chlorine Sunday/Wednesday and auto feeder tabs set at 1.5

The city water is at 150

I haven’t added water since 9/30 it’s rained s few days and cloudy lately so evaporation hasn’t been enough to need to add water

The CSI level has been around -0.2 ish it’s been gradually getting lower as the temperature has been dropping

- - - Updated - - -

Here is a photo
FFDFF714-E901-4F82-B600-FF6D92ECB10F.jpg
 
Great. Not much else you can do. Your CH will rise anytime you have evaporation and use that fill water. Testing also has small variations so a test of 300 or 350 ppm CH is within a couple drop variation.

Are you confident what you show in that picture is scaling? Appears to be mottled plaster. Which is quite common with darker plaster finishes. It is related to the application process, not the water chemistry.

Take care.
 
mknauss said:
Great. Not much else you can do. Your CH will rise anytime you have evaporation and use that fill water. Testing also has small variations so a test of 300 or 350 ppm CH is within a couple drop variation.

Are you confident what you show in that picture is scaling? Appears to be mottled plaster. Which is quite common with darker plaster finishes. It is related to the application process, not the water chemistry.

Take care.
Click to expand...

Could be, when I asked the pool installer he said it was scaling...
Said to use some chemical in summer to clear it up but I didn’t bother with that...

But maybe it is what you said and could be mottled

My wife is like it’s clear it’s nice don’t worry heh

But I wanted to make sure it wasn’t the calcium and try to keep it below 350 as stated on pool school page...
 
Maintaining your CSI in the range of -0.6 to 0.6 will prevent scaling. So no need to aggressively lower CH. My CH reaches 1000 ppm and no scaling by managing the CSI.

Do a search of the forum with the term 'mottling'. Read some of the articles from OnBalance. I believe you will find it is a plaster application issue. The pool installer will never admit that.
 
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