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Hypo ratio


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To start with it all depends what strength sodium hypochlorite (hypo) you buy as you can get 7% 0r 14-15%


Myself I buy 14-15% hypo so on concrete pavers I would dilute it 1:1 to give roughly a 7% strength.

Be warned that hypo can damage certain types of natural stone and tarmac surfaces

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I did try on these slabs 1 to 1 it did not make much difference so I sprayed neat and still not great any ideas?these slabs are very bad all with black spots..

How long are you leaving it to dwell for? You can leave it to dwell longer but just make sure it don't dry

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