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|style="background:#efefef;"|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[Slow sand filter|缓沙过滤器]]</div>
|style="background:#efefef;"|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[Rapid sand / gravity filtration|快速砂/<br>重力滤砂]]</div>
|style="background:#efefef;"|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[Upflow roughing filter|上流粗滤器上流式粗效过滤器]]</div>
|style="background:#efefef;"|<div class="center" style="width:auto; margin-left:auto; margin-right:auto;">[[Chulli pasteurization|传统粘土炉巴氏消毒法]]</div>
|style="background:#efefef;"|
