I checked my readings about 2:30, it was a light yellow, so read about 3?? I don't get it? I put another 5 gallons in. The water is no longer green, it is a cloudy blue. Can't see the deep end yet due to cloudiness. I never got around to posting this, smile? I checked the water again, it is still not real high, maybe pushing a 3 1/2-4 at the most? We put the Kreepy back in. Someone gave me info. on a place that has liquid chlorine that is 12% at a giood price, what about that?