Illinois Septic Installers Complete Practice Exam 2025

Question: 1 / 400

In what incremental distance must distribution lines be set for raised filter beds?

10 inches

15 inches

Distribution lines for raised filter beds must be set at an incremental distance of 15 inches to ensure proper hydraulic distribution of effluent across the filter bed. This distance allows for even distribution while maintaining adequate separation to promote effective treatment and prevent pooling.

Setting the lines too close can result in uneven distribution, where some areas may receive too much effluent while others receive too little, leading to inefficiencies in the septic system. On the other hand, setting them too far apart can lessen the effectiveness of the filtration process, as the effluent may not have enough contact time with the filtering media.

In summary, a 15-inch spacing strikes a balance that supports optimal performance of the raised filter bed system, making it a critical standard in septic system installation.

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20 inches

25 inches

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