Affiliate marketer (and dealer?) who fails to clearly specify his sponsors and how much they contribute to the site - https://www.whatsthebest-hottub.com/forum/index.php/topic,24525.msg216066.html
Test the water for metals. Where was the fill water from? Iron can make a yellowish to oranges tint. Take Vitamin C crushed up rubbed on it....what happens?
Cant just specify rebar from the air. All depends on the site requirements and the actual shell strength needed. Most pools are formed with #4 bar and #5 is used on heavier structural loads