[James pryer]

Hi all,

On a 2 day job and have come across white spotting on block having. Put a 7% hypo mix on it and so far I can’t see any change.
Anyone know how to shift this?

Thanks

[Smudger]

usually does the trick - try stronger dose - just double check its not white stones in the paving itself

Darran

[James pryer]

Do you hypo before pressure washing? Or pressure wash then hypo?

Thanks Darren

[Slacky]

Pressure wash first then hypo usually.

Then rinse, or turbo ...

[Smudger]

yes as above pressure wash first - then hypo  otherwise your using hypo on dirt that is not cleaned by using hypo + things like black spot and slightly lesser white spot form a hard shell that chemicals find hard to penetrate if you turbo it breaks this shell allowing hypo inside and destroys the lichen much more effectively

Darran

[the king]

What percentage hypo mix to you lads use for black spot

[Smudger]

50% to start - if still there neat
applied through ik sprayer so not wasteful

Darran