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Side by side comparison of sidewall absorption in medium sand and fine sand shows that sidewall absorption plays a significant role in the release of effluent from a soil absorption system. Chamber sidewall is also compared to an aggregate sidewall, with a significant difference in upper sidewall evident using this media. Variation in absorption with depth indicates that fringe length will have a greater influence than sidewall height in the performance of a trench in the two sand media tested. Fines sand run consistently slower over the range of depth without the upper fringe efficiency observed in the coarser media.