Discussion in 'Pressure Washing' started by rshandyman, Sep 19, 2014.
At what ratio should I mix water with hypo to spray slabs without damaging them?
3 parts water to one part hypo. (1 litre hypo 3 litres water). Leave to dwell for 15/20 minutes then rinse off. Just be careful not to let the hypo dry while it's dwelling always keep it wet
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
14 -15 standard slabs I believe.
Another way I have used is to saturate the slabs with water, then brush on undiluted Hypo.
Wow! 15% is mental potent stuff to be putting down neat even with the slabs wet
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