New to TT - sewer question or lack there of

When we have to stretch the use of the gray tank, we wash dishes using a bucket to catch the rinse water. We also use a bucket to catch the water wasted before it warms in the shower. At times we have used a large plastic tub to catch most of the gray water during a shower. All this gray water is used to water the bushes or sand grass around the campsite. I know some will have a problem with this but it does enable us to extend our stay if you are in a primitive enough site. We dump no food scraps. All dishes are wiped with a paper towel prior to washing.