In article ,
bigboard writes:
|
| I have a diverter on my downpipe that sends all the rain water from the roof
| and waste water from the bathroom to my water butt. I've never had any
| problems using this to water the garden, and despite rumours, I use soap
| regularly!

Soap biodegrades easily, and household detergent isn't much worse.
But you can cause trouble by watering with nothing but soapy
water in dry weather, as the water may evaporate or be used faster
than the bacteria can break down the soap.

As with using alkaline water, a good rule is to flood the area
infrequently. DON'T water little and often with unclean water.


Regards,
Nick Maclaren.