Frontier is the perfect 'just in case' back-up filter.
Frontier是理想的应急备用过滤器。
Another major source of EBSM waste water is the back flushing waste water of the anthracite filter, whose back flushing waste water for each time can be up to 150 ~ 200 tons.
装置废水的另一个主要来源是无烟煤过滤器的反洗废水，其每次的反洗废水高达150 - 200吨。
Carry the Frontier filter as a back up on multi-day backpacking trips in case larger pump filters clog or become damaged.
携带Frontier过滤器可作为多天背包旅行的备用，用于大型泵式过滤器阻塞或损坏后。
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