New pool, first tests results show no chlorine?

I’m a new pool owner and new to the forum (although I’ve already read and learned a lot from here). My pool builder (PB) just finished our gunite pool with pebbletec and filled it with water 4 days ago. It was filled with “spring water” and the day of the PB came and added 6 gallons of Muriatic acid, two half gallons of some type of metal protectant, and put one 3” chlorine puck in each skimmer.

My wife and I have been brushing the pool twice a day and skimming as necessary. The PB said...

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