Is this calcium scale?

RPSalty · Aug 14, 2023

I have these build ups. If I address them promptly, they are soft and easily brush away. If I wait, they harden and require a stone rubbing. Some are pebble like, others are streaks. All no matter when I address them, they leave the surface smooth and white where the blemish was. They tend to return at the same spot.

My chemistry is within recommended parameters. Which chemistry should I adjust to stop theses formations?

mknauss · Aug 14, 2023

Read Plaster Installation and Maintenance - Further Reading and see if any of those issues are comparable to what you are seeing.

RPSalty · Aug 14, 2023

==========================================
Mrfypark
------------------------------------------
Build Type: Plaster
Volume: 15000 gallons
------------------------------------------
Latest Test Result Summary:
FC: 3.5 (18 hours ago)
CC: 0.0 (18 hours ago)
pH: 7.8 (18 hours ago)
TA: 80 (18 hours ago)
CH: 375 (18 hours ago)
CYA: 50 (18 hours ago)
SALT: 3000 (18 hours ago)
TEMPERATURE: 95° (18 hours ago)
CSI: 0.21 (18 hours ago)
==========================================
------------------------------------------
Test Results 08-13-2023 @ 04:01 PM
------------------------------------------
Free Chlorine: 3.5
Combined Chlorine: 0.0
pH: 7.8
Total Alkalinity: 80
Calcium Hardness: 375
CYA: 50
Salt: 3000
Temperature: 95°F
CSI: 0.21

RPSalty · Aug 14, 2023

mknauss said:
Read Plaster Installation and Maintenance - Further Reading and see if any of those issues are comparable to what you are seeing.

Good read. I believe the issue closely resembles calcium nodules.

The resurfacing was done over marcite around 2012. There was concern about the prep work before the pebble was applied. I guess I'll just keep brushing it off. One 2"x2" area the plaster came off and the edges now grow.

Thanks for your guidance.

Is this calcium scale?

RPSalty

mknauss

RPSalty

RPSalty