I have just had my in-ground gunite pool retiled and plastered with plain white plaster. The contractor is in the process of balancing the water. It is a 14,000 pool with spa. New Variable speed pump, CircuPool RJ 30 SWCG(new). in-line chlorinator (for now and winter based on contractor recommendations), DE filter, heater and waterfall.

As a beginner with saltwater I have many questions(I'm in a daze as I continue to research). What test kit, digital device, etc should I get? I have ordered the Hach Silver 7way test strips with a new Polaris 280. Should be delivered today. Are these useable or should I throw away?

What is the best salt to use, is there a difference? I was leaning towards Aquasalt. Pool contractor said that I needed to wait at least 4 weeks before adding salt, thus the in-line chlorinator, why? Is this true?

Thank you so much foir your help!
Dakota