Pebble Sheen Plaster Formation

[ACastillo]

Any idea what might cause this? The this volcano looking structure has formed on the pebble sheen plaster in the shallow end of our pool. The plaster is 2.5 yrs old and Ca levels have always hovered around 300ppm. Its hard like calcium but has a cavity in the middle (like a crater). its maybe half an inch in diameter and protrudes about half an inch from the plaster.

Castillo Pool 2022

• ACastillo
• Jun 2, 2022
• 1

Pool photos

 

[ajw22]

Probably a calcium nodule. Read...

Calcium Nodules in pools

What are calcium nodules? In swimming pools and spas, they are small mounds, bumps, deposits, or “slag” piles of calcium carbonate which are formed from material that has been released from the plaster. The small calcium nodules are rough to the touch, hard, and generally gritty. Nodules may...

www.troublefreepool.com

Plaster Installation and Maintenance - Further Reading

www.troublefreepool.com

@onBalance

 

[ACastillo]

Probably a calcium nodule. Read...

Calcium Nodules in pools

What are calcium nodules? In swimming pools and spas, they are small mounds, bumps, deposits, or “slag” piles of calcium carbonate which are formed from material that has been released from the plaster. The small calcium nodules are rough to the touch, hard, and generally gritty. Nodules may...

www.troublefreepool.com

Plaster Installation and Maintenance - Further Reading

www.troublefreepool.com

@onBalance

Thanks so much for the suggestion. That sounds exactly like what I have. I may carefully take pumice stone to see if I can take it down and see if it comes back.