All,
Having powerwashed my footpaths in Sep last,
it did not take long for the surface to take on
a green colour. There are fir trees nearby, if
that might have anything to do with it.
Any advice on a solution to this ?
Any product to recommend to apply to the
path (having powerwashed them again of course).
In Ireland with our damp water algae I think will always grow. Its just cause of where we live..hard to defeat something thats been around a few hundred million years. I think areas with less sun are more prone to it as they are damper longer etc. i think power washing frequently, as well as scrubbing down with wire brush/jayes fluid is the only way.
This is one I have seen suggested elsewhere:
"Wash down the affected area with a dilute solution (1 part in 10) of
household bleach once a month. That will deter the algae."
having said that, its not so environmentally friendly...
You should find plenty on this site http://www.pavingexpert.com/home.htm to help. If you run a search on algae or look at the site map it gives plenty of options for investigation/reading.
I use Moss Go or Moss Kill - one is slightly dearer than the other. Spary on, leave a few days and powerhose off again. I also use washing crystals and scrub with yard brush before powerhosing. BTW too much powerhoseing may be bad for your paths.