Moss rock as waterline tile?

57cheby

Well-known member
Aug 1, 2016
51
Montgomery tx
Building salt ig pool and builder wants to put 28ft of moss rock across back of pool with waterfall on top. I know this will look great but shouldn't we use a waterline tile for longevity? I have seen some natural stone color waterline tiles that seem to work but I don't want those all around pool we want a blueish color, so I guess we could mix. Anyone tried this?
 

grottoguy

LifeTime Supporter
Aug 24, 2014
462
NJ
I'm not exactly sure what you think your PB intends to do. I have moss rock on the back of my pool but it is actually in the pool on a shelf so there is no tile in that section. But if you put the moss rock on top of the deck then you would still need tile.
 

gwegan

TFP Expert
Apr 19, 2013
2,769
Sacramento, CA
While there are many pools constructed with natural rock in the pool that's not what is usually done. Most waterfalls are constructed on top of the bond beam and on top of a tile line.

Most pools have tile lines because they are easy to clean. It can be difficult to clean calcium buildup off of natural rocks or the cleaning solution may harm the rocks.

I would talk with your pool builder and clarify what he plans to do.
 

57cheby

Well-known member
Aug 1, 2016
51
Montgomery tx
Thanks for your help. Pb likes the moss rock under waterfall for realistic look and I also, however I have seen several in person that were built this way and the white salt line across rocks looks bad and deteriorates into pool.
Anyone here have a pool that's 10 yrs or older built this way and still looks good?
 

JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
17,444
Tucson, AZ
Pool Size
16000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
My waterfall is built with natural stone and there's about a 5-ft section where the stones overhang the ledge and sit in the water (there are also a few under the water as well, so no water line tile in that section. They look ok but you can definitely see a waterline on them when the water level drops. I've also noticed that in two spots under the water where the pebbletec contacts the stones, I get growth of calcium carbonate crystals (looks like white fluffy stalactites). They rub right off, but it is interesting as it is the only spot in my pool where that happens. Also, calcium scale (looks like yellow-white mucous but it's solid) develops on any of the mortar surfaces as well as some of the stone surface. The only way to clean that with causing acid damage to the materials is to using a tile cleaning service that practices soda blasting. My waterline tile remains beautiful and scale free but the rocks in water act completely differently in terms of scale.
 

57cheby

Well-known member
Aug 1, 2016
51
Montgomery tx
That's exactly what I'm trying to avoid. Thanks for verifying that for me I was on the fence but unless the PB has other info, I'm using a natural looking tile under water fall. Thanks again.