What type of material should be used as the bedding for a gravel system?

Using coarse gravel with varying sizes as bedding for a gravel system is essential for several reasons. This type of material provides adequate drainage and ensures effective percolation of effluent through the soil layers. The varying sizes in the gravel help create voids or spaces, which allow fluids to flow through easily while also providing enough support for the piping and components of the system.

In addition to drainage, this bedding material helps prevent the clogging of the infiltration system. Fine sand, while it can provide drainage, tends to settle more than coarse gravel, which could lead to reduced effectiveness over time as particles may compact. Clay soil is not suitable because it holds water rather than allowing it to drain, leading to potential backing up and system failure. Crushed stone, while durable, may not have the necessary range of sizes to allow for optimal drainage and effluent distribution. Hence, the use of coarse gravel with varying sizes is the most effective choice for ensuring that the gravel system functions correctly and efficiently.