I just chipped this stuff of a couple of weeks ago and its back. What is causing it and how do I remove it for good? Usually I can use my fingernail and break it apart.
Also my pool plaster sometimes looks like this where you can see spots
On the side. There are also a couple of areas where the plaster appears to be worn down to where you can see whatever is dark behind it. Pool is 12 years old and previous owner did not take care of it.
Sent from my Galaxy Nexus using Tapatalk 2