[Griffus]

A nice thought derek but some of our jobs take getting on for 50 + full cans :-)

On these bigger jobs we have at least two applying weedkiller at the same time.

One thing I failed to mention earlier and that I feel gave even better long term results last year. When sealing is not requested we apply weedkiller immediately after sanding rather than immediately after washing.

The idea being to soak the sand with weedkiller and thus help prevent seeds sprouting from the sand and hopefully kill those that start to grow from beneath the blocks.

As long as care is taken not to flood an area this even help bed in the sand too.

[gwrightson]

whilst we are on this topic, I was taliking to a custy yesterday about the cleaning of block paving,
he said he had used a product that is simply spayed on and over a period of time , a number of weeks I believe. It cleans itself, he used the terminology " it weathers itself off " !!! 
does any body know what this is? is it any good? and how exactly does it work ?

geoff

[Griffus]

Could be Algon or the much more expensive Byotrol.

Only work on organisms though (as far as I am awre).

[Les]

I tried a product of this type called 'Simply Gone'.

Quite expensive but that's ok if it does the job. My observation was that it could probably work on light amounts of algae or moss it was not effective on thicker growths.

I won't be buying any more 

Les