White hard buildup and chalky looking areas

[Jmstange]

I have been maintaining our "new" pool for a month now and it looks worse now then it did when we first got it.
Here are todays numbers:
FC 4.5
CC 0
PH 7.6
TA 70
CH 325
CYA 50
temp 78
CSI -.14

Problem one: Only one of my 3 kids has a chalky feeling and residue on her skin after she gets out of the pool.
Problem two: A calcium looking buildup at our spa wall has gotten bigger and thicker, other spots have shown up in various locations mostly at the spa wall, and our spillover now has a chalky white film look that wasn't there when we started this venture. I'm afraid my husband won't let me continue to care for the pool myself if I don't get this worked out. Thanks a ton!!

 

[Texas Splash]

Welcome! Your test numbers above look excellent from your TF-100. They show no indication of general scaling or anything wrong from your water/chemical management. What I see coming from the tiles looks to be more of moisture seeping-out from the stone/grout. That's beyond your control. But hang tight and we'll let a couple more set of eyes take a peek at your pics.

See this thread as a possible simil example"

Grout Efflorescence in Several Areas

I have Grout Efflorescence occurring in several areas of the tile wall (above the water line). It only occures on the "higher" side of the pool. The lot has a heavy slope and one wall of the pool is higher, holding back this area. It appears that ground water is leaching thru the tile/grout...

www.troublefreepool.com

 

[Jmstange]

Welcome! Your test numbers above look excellent from your TF-100. They show no indication of general scaling or anything wrong from your water/chemical management. What I see coming from the tiles looks to be more of moisture seeping-out from the stone/grout. That's beyond your control. But hang tight and we'll let a couple more set of eyes take a peek at your pics.

See this thread as a possible simil example"

Grout Efflorescence in Several Areas

I have Grout Efflorescence occurring in several areas of the tile wall (above the water line). It only occures on the "higher" side of the pool. The lot has a heavy slope and one wall of the pool is higher, holding back this area. It appears that ground water is leaching thru the tile/grout...

www.troublefreepool.com

Thank you!! Do you know why the spillway suddenly shows that film to both sides? Is that common?

 

[Texas Splash]

Do you know why the spillway suddenly shows that film to both sides? Is that common?

Common? Well, it happens enough when moisture conditions are just right behind the stone or grout. What you need to do is determine the source of that moisture, Tomorrow I would contact your builder. There's a possibility the moisture is seeping through from the spa itself at which point the builder needs to find out of there is a defect in the plaster or plumbing. Let the builder see what's happening. Then you can clean the surface by removing the residue. Like in the article above, you might need to use some diluted muriatic acid.

 

[Jmstange]

Common? Well, it happens enough when moisture conditions are just right behind the stone or grout. What you need to do is determine the source of that moisture, Tomorrow I would contact your builder. There's a possibility the moisture is seeping through from the spa itself at which point the builder needs to find out of there is a defect in the plaster or plumbing. Let the builder see what's happening. Then you can clean the surface by removing the residue. Like in the article above, you might need to use some diluted muriatic acid.

Unfortunately, the previous owner had the pool resurfaced in 2017. I have no idea when it was originally built or by who. I will work on cleaning it up and keeping a close watch.