On 08/04/2021 19:02, David wrote:

Only one issue:
"do not allow the chemical to enter drains or waterways"
so I'm not sure how you are supposed to treat any roof unless it is
absolutely certain that it only drains into a soak away.

Exactly - and how do the professionals who use the same chemicals stop
it entering the drains. They probably don't!

You will be diluting the BAC50 10:1 to 20:1 and then just wetting the
roof and letting it dry. There will be little run-off to the drains at
this point. Anything thereafter will be diluted much further by any rain.

The amount that enters the drainage system for a one or two off
application is probably no worse that than what gets put down the toilet
or sink plug on a daily basis.


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