I'm not the expert on SWGs Anna, but what little I know you are mostly correct on all counts, except the copper (it does turn blond hair green). You must also add a salt test, but the SWGs usually have that tester built in.

Two unnecessary liners. Totally.

However the world is FULL of people who know more than us about pools and pool maintenance. People with green pools and people who shut their pools down because it was too much trouble.

I used to go to a dentist who had a sign in his office that read "There is nothing the doctor can do that the patient cannot undo..."

Or as the old joke: How many psychologists does it take to change a light bulb? One, but the light bulb really has to want to change.

If your friend persists in her reluctance DESPITE seeing how beautiful your pool is and how little you do to maintain it, give up and have her come swim at YOUR house! (at least you'll always know your water is sanitary! )