Calcium scaling - i messed up?

[grottoguy]

As I indicated in another post about this topic,

My Plaster was finished early June last year and when I opened last week the PH was very high. After three gallons of 32% acid (over a three day period) it went down to about 7.4. I ran my Polaris for a couple of days and it kept filling up with what looked like crushed ice. But now reading the other thread about calcium scaling I assume it was calcium (although it looked more crushed than the pictures posted there). Anyway I ran my hand over the walls and I felt the roughness. On the other post, it was suggested to lower the PH to 7.2, and I just did that, but I THINK THAT WAS A MISTAKE FOR ME. MY CSI was within the acceptable range, but now it will be -1.0

MY CH is 225 (hasn't changed since opening), TA 60 (hasn't changed since opening), CYA 30 (hasn't changed since opening), FC over 5 (I didn't do the more precise test this morning). MY CSI was -.42 this morning, but I read in the other thread (which was addressing someone else) that PH should be lowered to about 7.2 to prevent scaling. I just poured in the Acid, but now I realize that a lower PH will cause my CSI will drop to -1.0.

What should I do?

Thanks

 

[Richard320]

Brush!

It won't take long for the scale to dissolve and go into solution, raising the CH and by extension, CSI.

Or just add some baking soda to raise TA which will raise CSI. However, it will also cause pH to rise faster.

 

[grottoguy]

Should I raise my calcium hardness directly by adding calcium chloride?

 

[Richard320]

Should I raise my calcium hardness directly by adding calcium chloride?

No. It will go up as the scale dissolves.

 

[grottoguy]

Thanks Richard. What should I be doing with my PH? What level should I keep it at to prevent scaling?

 

[pooldv]

You need to keep your CSI score between -0.3 and +0.3. Enter all your test results in poolmath and see what PH is needed based on current TA, CH, water temp, etc. PH is the easiest of the levels to adjust that impact CSI.

More here
Pool School - Calcium Scaling
and here
Langelier and Calcite Saturation Indices (LSI and CSI)

 

[grottoguy]

Just to clarify, it's not -.6 and positive .6. It's between -.3 and + .3. Is that because I already have a problem?

 

[pooldv]

No, if you keep it between the 3s then there is a little room for numbers to shift a bit and stay between the 6s in between tests.

 

[grottoguy]

Ok. Thanks