多層複合濾料水質淨化系統(又稱MSL系統)為日本開發的新型的自然淨化系統，MSL系統為近年在臺灣較熱門的現地處理設施。台灣許多地區的河川或水庫的水體是有受到污染的，其中沿海地區的污染水體容易受到海水潮汐及海風的影響使水體中含有部分的氯化鈉。本研究透過行政院環境保護署對於台灣各水庫及河川的水質監測報告中發現，台灣離島的水庫及本島沿海河川段均有氯化鈉較高同時水體受汙染的狀況存在。而若需使用MSL系統對這些地區的水質進行改善，我們則必須要去探討氯化鈉對於MSL系統削減成效的影響。
經過實驗證實氯化鈉對於MSL系統的削減成效存在負面的影響，其中對於氨氮及化學需氧量的削減成效影響最大，磷酸鹽及硝酸鹽氮影響較小。以這個實驗結果提出兩種解決方案1、更換系統滲透濾層材料為沸石(稱之為Z-MSL)。2、更換系統馴養方法(稱之為T’-MSL)。並經過實驗證實兩種方法均對於減少氯化鈉對系統的影響有好的效果，其中在減少氯化鈉對化學需氧量削減成效的影響，僅有更換系統馴養方法有效，更換材料為沸石對於減少氯化鈉對化學需氧量削減成效的影響，並無顯著的成效。

The Multi-Soil Laying System (MSL system) is a novel Natural Treatment System (NTS) that created in Japan. In recent years, the MSL system has gained popularity as an onsite purification facility in Taiwan. Many rivers and reservoirs in various regions of Taiwan are polluted. Coastal areas, in particular, are susceptible to contamination influenced by tidal fluctuations and sea breezes, leading to the presence of sodium chloride in the water. This study examines water quality monitoring reports from Taiwan's Environmental Protection Administration and identifies elevated levels of sodium chloride in reservoirs on Taiwan's outlying islands and coastal river segments on Taiwan’s main islands, indicating water pollution. If we want to improve the water quality in these regions with the MSL system, it is necessary to investigate the impact of sodium chloride on its efficiency.
Experimental results confirm a negative impact of sodium chloride on the removal effectiveness of the MSL system. The greatest impact is observed on the reduction of ammonia nitrogen and chemical oxygen demand, while the effects on phosphate and nitrate nitrogen are less pronounced. Based on these experimental result, two potential solutions are proposed : (1) replacing the permeable layer material with zeolite (referred to as Z-MSL) (2) modifying the system culture method (referred to as T’-MSL). Experimental validation demonstrates that both approaches effectively mitigate the adverse effects of sodium chloride on the system. However, in terms of reducing the impact of sodium chloride on chemical oxygen demand removal, only the modifying the system culture method proves effective. The replacement of material with zeolite does not yield significant results in reducing the impact of sodium chloride on chemical oxygen demand removal.

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