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ruler

 

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Topic: Loads little black marks on paving< Next Oldest | Next Newest >
Helpmeplease
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Apprentice




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Joined: Feb. 2008
Posted: 05 April 2017,23:10 QUOTE

block paving laid some 5 years ago
sealed with Resiblock and sealed again months later
pretty sure all that did was bind the sand as it sure never seemed to protect the pavers
they have been pressure washed every year till last year when pressure washer broke ...done again now and resanded
loads and loads of little black algae / mould marks over them
have tried pouring bleach on the pavers but to little effect
ideas please
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seanandruby
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sean




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Posted: 06 April 2017,07:22 QUOTE

read this

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sean
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Tony McC
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Site Agent




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Posted: 07 April 2017,09:32 QUOTE

Do as Sean suggests and then post some photies so we can check the diagnosis.

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ruler

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