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Yes that is the ratio we use too. We get ours at the local pool store and it is called: SeaKlear Chlorine- Free Shock Oxidizer

We experimented with lower bleach concentrations despite it being cold on the last job, and due to the cold shingles we did not find that to be a benefit. I would stick with your same strengths and just add the SeaKlear in the tank.

It is just nice to be able to clean surfaces this time of year.

I have heard or read that the lichen, moss etc are more brittle this time of the year. Is that true? Does that make it easier to kill and result in quicker release times?