Confirm this is trowel mottling?

[Davey_crocket]

Hey guys,

I had the pool half drained over the weekend (was exchanging water to get rid of iron from bad salt) and got a chance to look at what the surface looked like dry.

Since we have owned the house the pool has always had a mix of white and grey mottling. From my reading I assume it is from trowling at construction. Wanted to see if anyone here could confirm?

Close up there is a stark difference in the colour given off by the bulk of the beads!

 

[Davey_crocket]

Plus what it looks like with water:

 

[ajw22]

Looks fine. I don’t know what problem you are trying to find.

 

[Davey_crocket]

maybe this shows it a bit clearer, the bottom has some areas that are distinctly grey, with others that are a much brighter white.

 

[ajw22]

View attachment 505328maybe this shows it a bit clearer, the bottom has some areas that are distinctly grey, with others that are a much brighter white.

Plaster Installation and Maintenance - Further Reading

www.troublefreepool.com

White Spotting of New Plaster Pools The problem of plaster spotting has been an ongoing puzzle and controversy in the swimming pool industry for over three decades. The generally round, smooth-yet-unsightly white soft spots in new plaster pools have long been a source of contention among pool plasterers, and pool chemical service firms or pool owners, each blaming the other for the phenomenon


How White Pool Plaster Can Turn Gray One would think that when mixing white cement with white limestone aggregate, the final pool plaster product would always be white. But that is not always the case. Unfortunately, white pool plaster sometimes turns gray (or grey) either immediately or a few months after the pool is filled with water. So what causes that to happen?