I've been battling my pool all season so far. My current readings from the Taylor kit are below:
A couple of weeks ago I drained two thirds of the water and refilled with fresh water so I'm surprised to see the CYA this high again. I've been using bleach and shock exclusively. My auto-chlorinator is turned off and I haven't been using any chlorine tabs.
As it stands, my pool is a milky green. I've been brushing and vacuuming to waste every couple of days and maintaining high chlorine levels to try and kill the algae.
What could cause the CYA to rise so quickly? And, at this point, what should my approach be?