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Slope of spillway can also be towards the pool (gaining elevation). Typically they are installed in the same elevation as the original unless advised otherwise.

Making up the difference in a swimming pool for evaporation, the autofill will run for long periods of time barely emitting water.

Fogging is when the plaster is kept in a humidified state while waiting to be filled.

That’s a lot of Shotcrete (thickness) giving off heat during curing. Only way to exactly know the extent of the crack and if their is a underlying cause will require exposing the area and finding the depth.

The pump needs to be properly secured down.

Do you have a picture of that area after excavation? Curious of how much Shotcrete was built out to make the shelf square.

This is the product that pool plumbers will use on thread to thread.

Water is not to get between the Bond Beam and the coping. This will cause problems with exspansive soil if water is introduced.

That is how most plaster companies apply glass during the application. It is an art of applying in a uniform manner. This may not have been the case on your spa.

Hairline cracks on the North side of the pool are more common due to the amount of sunlight, fogging can reduce the amount.

Tiles actually from Mexico that the customer picked up.

It may get bigger when exposed to air, remove the unstable plaster until solid plaster is present. This product is durable and commonly used for this type of application.

These cracks are allowing water to come in contact with the Shotcrete shell of the pool that is not water proof. The last two pictures show calcium buildup from the water most likely contacting the shell. This plaster may be cracking from the Shotcrete that it’s been applied to if rebound was...

Can you provide a picture from farther away to give more context to the situation?

Sorry for the late response, taking everything into consideration, movement is occurring in that area of the pool and the weaker concrete’s are having larger issues than the pool shell that is the strongest of all the surrounding materials. The top priority is the vertical crack in the pool...

PM sent.

We plumb one on every heater.

An overflow pipe could have been installed during construction, this is typical on pools that are at + elevation continuously around the pool. At this point in time, the installation would create a lot of removal and remodeling of the spa, that’s something to consider.

Because everything worked perfectly in the past and now has troubles, I would have to lean towards a restriction in the plumbing. The Hartford Loop is typically installed inside the spa wall for best performance. How old is the pool and has it been remodeled recently?

From the picture provided I can’t see any continuation of the crack on either side past the single tile. At this point in time it may be an isolated incident with no underlying structural damage. Typically the grout will show signs of cracking before the tile when movement is involved.

What type of skimmer is installed for the spa?