Ask Umbra: How do I clean my too-green roof?

Grist
By ghanscomFeb 17, 2014, 7:06 am20 pts
Q. There is lots of moss growing on our concrete tile roof. Do you have any advice on getting rid of it? Looking online, I see several recommendations for a product that uses hydrogen peroxide, which it says is eco-friendly. Do you agree? Our drinking water comes off the roof and is collected into a cistern.…

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