Well water strategy

[zz28zz]

Pool was filled, after re-plaster, with city water. Same pool will be maintained on well water.

Tested the well water with my brand new Taylor K2006C test kit.
It shows:
Cal Hardness = 220
PH= 7.4
TA= 370 (wow)

Currently the pool is at:
PH=7.4
TA= 110
FC= 2.0 ppm
CC= 0.0 ppm
Cal hardness= 110
CYA= 30
CSI= -0.3

Plan for TA is to lower PH to 7.0-7.2 and hope TA drops. Running pump 12hrs/day with spa overflow aireation (sp?). CYA is right at lower limit and will only go up since I use trichlor tabs occasionally. I know the Cal Hardness needs to be higher but fill water should bring that up slowly. Just not sure how long it can be low and not effect the new plaster. Thoughts on Cal Hardness and/or TA plan??

 

[proavia]

Suggest increasing the CH to 200-250 now.

When was the replaster done?
What plaster startup process did you use?

 

[zz28zz]

Re-plaster is abt 1 week old.
Used NPT startup guide.

Any tricks to adding ~40 lbs of calcium chloride? Should I broadcast 40 lbs all at once?

Seeing different "ideal ranges" for plaster pools. Pool Math app says 350-550. Taylor kit says 200-400.

Fill water (well water) CH is 220. Does CH keep increasing over time or would it, in theory, peak at 220 if I didn't add calcium chloride? Refilling pool due to chem overshoot is a big concern for us.

I'm headed to the pool store to pickup a 45 lb bag that I'll be adding but wanted to understand what to expect over time in regards to CH.

 

[zz28zz]

Got my CH up to 200. Lots on confusion abt how it should be added to the pool. Per the pool store guy and per the label on the bucket of Hardness Plus, they both say not to mix in bucket but broadcast it into the pool. Everywhere else I look it says to desolve in a bucket. Used a bucket but only 2 lbs of calcium chloride at a time. Bucket did get warm but nothing serious.

 

[proavia]

Great!
Continue to follow the NPT startup guide.

With a fill water CH of 220 your CH will continue to rise as water evaporates and you refill from your well.

 

[zz28zz]

Just hope it rises very very slowly. No more cal-hypo shock either I assume.

BTW, when I added the 15.5 lbs of calcium chloride, the next day all chlorine levels were found at zero!? Fortunately they came right back up to 4ppm FC with 0.75 gal of 12% chlorinator liquid.

 

[proavia]

Just hope it rises very very slowly. No more cal-hypo shock either I assume.

BTW, when I added the 15.5 lbs of calcium chloride, the next day all chlorine levels were found at zero!? Fortunately they came right back up to 4ppm FC with 0.75 gal of 12% chlorinator liquid.

No more calhypo - you don't need the calcium.

That has been reported by a few others as well.
No idea why it happens to some and not to others.
Good news is you were able to increase your FC without issue.