Limestone spa wall eroding into pool

[NewPoolGirlTX]

My pool is 18 years old and neglected, if you are following along

My spa has a spillover and the exterior spa walls are Texas limestone. The mortar is cracked and eroding in several places and sending it into my pool. It's also got hard calcium deposits

I have a request for an estimate
But I am also a wanna be DIYer.
My questions:

How to repair the mortar?
How to remove the calcium deposits ?
How to seal the stone to prevent this?

Pics attached
I am hope, hope, hoping to get the pool resurfaced and equipment leveled and repaired this fall but I can't be sure it will happen right now.

Is it worth trying some temporary repairs in the interim, and hope they hold until I am sure we can resurface? One company suggested a tiled area under the spillover, when we resurfaced

Ideas, knowledge, advice, are trruly appreciated

Marci in Austin

 

[ajw22]

Welcome to TFP.

You can try chipping out the rumbling mortar and replacing it with Type S mortar.

I think what you call calcium deposits are Efflorescence - Further Reading

Sealing the stone is not going to prevent "this". Whatever this is???

Better to strip the stone off the spa when you resurface the pool and put tile on it with high quality materials.