Rubbing, scrubing, brushing had no effect on patches last year. This year we have rubbed with the brush on the vacuum head, and you see ZERO improvement.

The readings this morning after adding bleach yesterday based on the calculator, and acid for the ph late last night, are

cl 14PPM
ph 7.4 -7.5
cya 30-35 (subjective to when the black ball is not visable)

david