Hi Janet,

I measured the chlorine level earlier this evening in my pool using the Taylor kit. The chlorine level measured at 11ppm. I did use the 10mL water sample in order to conserve the reagents - thanks for the recommendation.

I will measure again in the morning and report back.

I am definitely thinking it is not algae and something in the water chemistry, maybe some metals or something else in the water composition that gives a green tint. The pool liner and water is clear, but there is a green tint to the water when you look at it through natural lighting. It is definitely not green on the pool lining, it is the effect is light passing through the water that makes it have the light greenish tint as you look into the depth of the water. It is still sparkling clear, just with a green tint as light passes through the water. It was not this way on day 1 after setting up and filling the pool.

Kevin