Originally posted by Rob Shauger
Has this had any negatvoe effect on the turf or plants around the area being treated?
Yep, sometimes we have just used domestic bleach and brushed it, leave for a good day and wash off really well. If you spray it everywhere and don't wash it off vegatation immediatley it will burn them bad.
We actually have our bleach made by a local factory (owned by my cousin) speciffically at.....4% somethingorother. Domestic is about 2% and most industrial strength are strong enough to really do some damage. I'd have to have the MSDS in front of me to quote you the concentration. We get two types made, one for cleaning and one for residual application to prevent the return of mould. Having used the term "residual" it depends on the amount of direct sunlight the area receives but we get about 12-18 months "retardation" of growth on average.
This from a relatively cheap product that does not require any specific licensing here to apply. Normal safety gear (as for any bleach) applies. Cleaning retaining walls started out as an extra service for us but can be a good sideline in summer time. The success of the treatment depends on how porous the substance is you are treating and what condition it is in when you start. Some old walls we have done needed three treatments to get them respectable. Also, bleach will remove organic growth, it wont remove water stains, mineral deposits etc.
Sorry I wasn't more informative in my intial post but I have a heap of quotes to do tonight.