Should I add a sump basin to my pool while its empty?

Hi guys,

I hope this is the right folder for this question:
I have a decent sized (25k g?) shotcrete pool that is 40 years old. Recently I have had some trouble with my hydrostatic relief valve (probably). I appreciate getting steered in the right direction here:

Leak deep underground, your basic pool nightmare

Hi guys, I'm new to this forum and having a terrible week pool wise. I'm hoping to get ideas and directions for how to DIY a repair as the local pool industry here is not very deep and is very busy. I've got a shotcrete (smooth concrete) pool with a gunnite surround. It's about 40 years old...

www.troublefreepool.com

I've got the pool empty right now while I wait for replacement part to arrive and I find...

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