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  James Gardner September 12, 2009 at 9:27am

  Looks like an algae, they're not all green.
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  Classic Gardens September 12, 2009 at 9:32am

  It's a micro organism called Haematococcus which is very common never use anti fungi cleaners as this could harm the birds.
  
  We had to move the bird table to a sunny area which helped the problem.
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  Jackson's Landscape Design September 12, 2009 at 9:33am

  Thank you James
  
  What i need to do is find the name of such algae, as I need to know as much as my client, again thanks.
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  Jackson's Landscape Design September 12, 2009 at 9:36am

  Thank you Martin
  
  You have saved me some quality Saturday time, will read up on this micro organism
  
  The unit is situated on a S/W facing elevation, move to north?
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  Classic Gardens September 12, 2009 at 9:42am

  Yes we did still didn't totally solve the problem though.
  
  The best advise I can give is to jet wash once in a while and leave it to dry in the sun, this should help.
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  Jackson's Landscape Design September 12, 2009 at 9:50am

  Spoke to my client,
  
  the bird bath remains in place as they have excellent viewing points from within the house. Ive no problems adding this bird bath cleaning task to the next list
  
  This is the exact reason why LJ will continue to grow, such a great site of which i'm very glad to be involved with
  
  Thanks all have a good weekend
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  Nick Steele September 12, 2009 at 6:49pm

  We get exactly the same problem in bird baths that we sell (manufacturer calls it stoneware, but really its just concrete!) - just give em a good scrub every now and then, and they're fine.
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  GORDON September 12, 2009 at 7:50pm

  I see this in 3 gardens. The material of construction does not seem to be a factor nor does the position in the garden. Despite the customers cleaning them regularly it comes back in no time flat. I guess a sealer applied after a good clean could sort the problem out. But as been said people are not going to risk the the health of the birds to find out.
  I actually think it looks attractive, but then again according to the wife I have no taste.
  She doesn't like it though when I say is must be why I married you then. Oops I never learn, bet she reads this later.
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  Helen Nock September 13, 2009 at 12:36am

  Very thankful for this info too because it might arrive in the bird baths I make and I'll need some answers. I havn't had any of my designs at home for long enough to experience this but our good old plastic standby has had it for years, and I thought it was just because I didn't clean it enough. Indeed, seems to make no difference and beneficial to the water.
  
  Found lots of links including this description
  http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.micros...
  
  ....and a good answer from source http://ph.answers.yahoo.com/question/index?qid=20070718015920AAvtPxg :
  
  Remedy....decorate baths with red interiors!!!!!!
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  Classic Gardens September 13, 2009 at 9:06am

  We had a client who said it was cement left over that was the cause of the problem even though we had only used it on the base. I actually belived him at first until I read in to it a bit more.