Question:
I have an 80,000 gal pool chlorine level is .5 how much liquid chlorine do i need to add to bring it up to proper range, ph is currently 7.4
Answer:
It depends on the concentration of the chlorine and if any combined chlorine is present. I assume you are getting 0.5 ppm free chlorine in which case you would need around 1.5 gallons of liquid chlorine or more.