It took me two batches of dishwashing to meet the dishwasher load goal. The first batch I calculated to be less than 1.72 gallons of water with the radius’s of the sink. The second batch was just under 1.25 gallons of water.
I’m currently using seventh generation dish soap. It meets all of Australia’s standards and requirements for graywater use. Here’s the link. https://www.seventhgeneration.com/blog/dos-and-donts-greywater-systems.
It took saving all the shower water of two showers to get over 3 gallons. I used dirty T-shirts to soak up the water that didn’t make it in desired destination and wring it into the bucket.
Here’s a sign I made for our patio. The dimensions are 5 1/2 inches by a little less than 20 inches. I used a woodburning tool and linseed oil. To install I used two hooks fastened to the back.