United Kingdom 
how can i remove algy from my rockery stones
16 Apr, 2010
Answers
Guest, why? Algae and moss add character to the stones on a rockery.
16 Apr, 2010
And lichen even more so! Actually, I'd bet a jelly bean that signifigant algae is a sign that the rockery is getting too much shade.
17 Apr, 2010
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Have you tried jet washing it works for me.
16 Apr, 2010