What spacing should distribution lines be set on in a recirculating sand filter?

In a recirculating sand filter system, the spacing of distribution lines is crucial for ensuring even distribution of wastewater over the sand media. The correct spacing of 3 feet allows for adequate aeration and filtering while preventing pooling or channeling of water in the sand layer. This helps to maintain the efficiency of the filtration process by ensuring that the wastewater is evenly spread, preventing areas of high saturation that could lead to clogging or reduced treatment effectiveness.

Setting the distribution lines at a distance greater than 3 feet could lead to uneven distribution, which can compromise the performance of the filter system. If the lines were set too close together, it could lead to over-saturation in specific areas, potentially causing backup issues. Therefore, the 3-foot spacing is a well-established guideline that balances the need for efficient wastewater treatment while promoting the longevity and functionality of the sand filter system.