Is it normal for TA and Calcium readings to go up??

[ship of fools]

My water is great and all is well

But .... i have been consistently testing low on CH (40+- but it's a vinyl) and 40+- on TA as well but wasn't too worried because my ph was stable.

I did a complete round of tests today and both the calcium (90) and TA (70) readings were much higher than in past tests. We have had a boatload of rain over the past 4-6 weeks but other than that the pool has seen nothing but liquid chlorine.

Here are the complete test results .... which are great and the water has been perfect all season

CL 6.0
CC 0
ph 7.4
CYA 35+-
ch 90
ta 70

Any thoughts on the TA and CH rise??

 

[jblizzle]

As water evaporates, the CH remains and the fill water adds more ... so pretty normal for the CH to rise.
What is the TA of your fill water? That could also cause the TA to rise.

 

[ship of fools]

As water evaporates, the CH remains and the fill water adds more ... so pretty normal for the CH to rise.
What is the TA of your fill water? That could also cause the TA to rise.

Only fill water has been from mother nature .... would rain do it?

 

[JasonLion]

Not usually, rain typically lowers TA. There are occasional exceptions however, so it is possible.