Hi
In the UK, you can expect the green slime, but not so much in the tropic's, but it happens.
Greenish effect,
Q. could this occur if the water from the tin roof falls on the flags?
Q. the flags are made from quarry dust and cement. it i treated then with the water repelant stuff , will that help stop the green coming?
The flags have been layed about 6 weeks, we've had the odd rainfall.
Any ideas of how to stop it.