Weta soil works but it changes you ph over time
Your just breaking the surface tension of the soil, so detergent does the same job, it's just way harder to get the right ration because there all different
Hydraflow from Scott's is better as it does not change your ph, it's just really expensive
Cover sand with a good layer of organic rich mulch and keep it irrigated, once it dries out you are back to the beginning.
If grass, keep a decent amount of length in it and mow without a catcher so as to return the clippings evenly over the lawn whenever possible (try every second mow). Kyikuyu is the easiest to keep green and maintain, couch looks great when green but needs lots of water to stay that way, buffalo needs special care or you end up with patchy dead areas.
Run your washing machine water out onto your lawn and move the hose each wash, great for getting water penetration in the grey sand.
Sort of right
Grass clippings when left on the lawn form a thatch, like a thatch roof, which will replel water, BUT if you collect your lawn clippings and compost them then return the compost to the lawn that is way better
When you run your grey water out onto the lawn the water will contain heaps of phosphorus, this will kill natives, especially west Australian natives.