Concrete Bonding Agent (SBR+) - disposal of watered down solution?

[Rollerball]

Had to mix up some SBR+ bonding agent (diluted with water, 3 to 1). Unsure what to do with what's left (about a litre of the mix).

I know it's not supposed to be tipped down drains but if I water it down even further can I dump it in an unused corner of the garden where nothing is growing (and no water course nearby, etc) without causing any harm or breaking any laws?

I do I have to bottle it up and take it to a council tip?

 

[freddiemercurystwin]

I'd have just lobbed it in the wheelie bin.

 

[scbk]

I've used leftover sbr before for painting on things that might benefit from a bit of waterproofing, old trailer floor, back of a shed, etc

 

[Rollerball]

Great idea, thanks.