muriatic

Hello All, Looking for some info to see if I'm doing things right and second to see if this is normal. My pool was built and finished April 2021. It is approx. 25k gallon. I always used 31% Muriatic Acid, but recently changed to Powdered Acid to see if it changed anything and still the same...

Trying to finally understand what happens to my pool every year. Even though I start with a clean pool, gradually an orange film develops on the walls above and below the water surface. At least once a year I lower the water to wash the walls with muriatic acid. I used to scrub with a soft...