Black water/grey water split plumbing

Running the plumbing for the house. There will be four full baths so there is quite a bit of plumbing to do. The four inch pipes will run the black water( water from the toliet) and it will end up in the septic system. The rest of the water, grey water, will run through the 2 inch pipe and be sent to a well that is currently not used. The grey water will be stored there and used later to water plants.

Just a closer view of how the black and grey water are split.  "graywater is household waste water from all plumbing fixtures except toilet and garbage disposal, which is blackwater. Rural homeowners with individual sewage disposal septic systems commonly divert at least their washing machine water away from the septic tank. The longer your septic tank has time to settle out solids, the better. And the less bacteria killing soaps and detergents in your septic tank, the better. Diverting graywater also reduces the load carried by your septic system leach field, greatly extending its life expectancy and effectiveness. In recent years, attention has been drawn to recycling graywater to conserve water and make better use of its fertilizer potential. Phosphate rich soaps and cleaning chemicals are considered pollutants when discharged directly into waterways, primarily because they accelerate algae growth, which in turn leads to oxygen depletion for fish and other marine life. The beauty of this 'pollutant problem' is the fact that mild household cleaning supplies are excellent sources of nutrition as liquid fertilizer for irrigation of trees, privacy hedge rows, and ornamental planterbeds." (https://www.thenaturalhome.com/greywater.html)

This shows where the grey water will be diverted out to the left of the two trees will be the holding tank for the grey water.

To get the fall needed for the black water we had to dig down quite a bit because of the distance from one side to the other.

So, after the plumbing was set and we ran pipe for the electric to go through( because the floor will be concrete), we got to move about 8 ton of 3/4 inch rock into the circle. That was far from fun but at least we had some equipment to help us out.

We have only filled one of the circles so far. Our plan is to fill them with rock and then put up the grain bins. After the grain bins are up we will fill in the other areas with rock ( about 4 inches throughout). Eventually we will get to the rebar and radiant floor tubing that will run in all of the main floor of the house, and then comes the concrete.