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Thread: Algae Removal

  1. 19th May 2010, 07:04 PM #1
    MISTERK
    MISTERK is offline New Member
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    Default Algae Removal

    Hi everyone,
    Just joined forum today.
    I have a cubby house with a small timber deck attached. Inhereted this from the previous owners. Not sure if it has ever been cleaned in 14 years.
    Tried to clean decking this afternoon with Reviva then Oxygen based bleach (diluted in warm water) then clorine bleach (also diluted in warm water). Unable to remove all of algae on all boards. I am not exactly sure of type of timber - I think treated pine.
    Any suggestions and help please. I was thinking of giving boards a light sand with an orbital sander to try to remove algae? Not sure.
    Thanks
    MisterK
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  3. 19th May 2010, 08:04 PM #2
    Chesand
    Chesand is offline GOLD MEMBER
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    Default

    Several manufacturers make timber cleaners - you scrub on, leave and then hose off. Haymes works on treated pine.

    They are usually based on Oxalic Acid so if you have a large area to do it will probably be cheaper to buy Oxalic Acid (available from paint stores) and make up a 10% solution and use as above.

    Make sure you use safety gear - gloves, glasses etc.

    Hope that helps
    Tom

    "It's good enough" is low aim
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  4. 19th May 2010, 11:00 PM #3
    One-i-
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    Hi
    You could always try to sand the boards back with a medium/fine grade paper, like you said. It might take more time but the results should be better and you can get a nice finish which you could then treat to help prevent any further build up of algae etc.
    wooden toys
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  5. 19th May 2010, 11:05 PM #4
    One-i-
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    Just thought of something else, you can also use a fine steel or wire wool, this will get into any divots or awkward places and pick up any unwanted debris
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  6. 20th May 2010, 10:25 PM #5
    MISTERK
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    Many thanks to everyone for your assistance
    MisterK
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  7. 21st May 2010, 12:02 PM #6
    stuffy
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    Oxalic Acid is O.K. for cleaning and restoring outdoor timber but to kill the algae you will probably need to use a strong bleach (sodium Hypochlorite) solution.
    Wash off one before using the other as the acid will neutralise the bleach and vice versa.

    best wishes
    Steve
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