Hi TheCount,

Products I’ve used and thought were quite good:
Eco-growth eco-wet (total eden, select nurseries, Ralphys)
Lawnporn moist (stratco, certain turf retailers, online)
Plant doctor nature’s soil wetter (twice the recommended rate though) (direct from them, lawntips store)
Aquaforce and biagra (can’t remember sorry)

Products I will use this summer which I think will be good:
Munns smart wetter (Bunnings)
Ralphys Refresh (Ralphys lawn and garden)

There are also heaps of options on the lawn enthusiast websites which are more commercially oriented but will probably be excellent and more economical.
I use soil wetter fortnightly on the sand over here in Perth. Some of these options may only be available over here too.

Cheers,

John