Pretty much everything I told the customers for years before finding tfp.
Regurgitating nonsense and misinformation passed down.
“Algae has evolved and is more resilient to chlorine”
“You have algae because you’re not running your pool long enough”
“Your phosphates are too high, your flow is poor”
“You don’t have chlorine because your kids are urinating in the water”
Sadly there is a lot of ignorance in this industry, and propaganda pushed by a lot of company’s trying to make money on products that reduce chlorine usage. I never heard of the fc/cya chart until I came here. Pool stores make money selling a ton of products, pool men make money taking care of your pool as cheaply as possible to capitalize gains. Cal hypo, tabs, copper, phosphates filter cleanings 2-4x a year. In 3 years it’s time to drain acid wash and refill because “the water is old”.