The reason we use a Wetter is because the soil/sand in Western Australia is very water repellent and the way we can combat this is by digging in lots of organic matter &/or apply a Wetting agent.

If you don't do this then your soil/sand underneath the top layer will stay dry and your plant/tree/lawn will not receive the benefits of the watering/fertilisers that you have spent your hard earned cash on,so it is very important.

I like to use a liquid Wetter because i find the granules don't work as well in our soils. Bentonite clay is a good addition in sandy soils and also acts as a wetting agent to add soil structure.

Watheroo Bentonite clay is sold here as well.

Here is a West Aussie product ( sold at Eureka )that works well for our soils here in Perth