The utility model relates to a filter, in particular to a vertical filter which can accomplish filter at one time with no materials left.

本实用新型涉及过滤装置，特别是一种一次滤完无剩料的立式过滤机。

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In a vertical filter made up of sand and gravel more than 80 % of the total nitrogen at 50 cm ground depth consists of nitrate, whereas only roughly 10 % consist of ammonium.

垂直过滤系统由沙、卵石组成，在离地面50厘米的区域，氮主要以硝酸盐的形式存在(80 %)，大约只有10%的氮是以铵的形式存在。

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In a vertical filter made up of sand and gravel more than 80 % of the total nitrogen at 50 cm ground depth consists of nitrate, whereas only roughly 10 % consist of ammonium.

垂直过滤系统由沙、卵石组成，在离地面50厘米的区域，氮主要以硝酸盐的形式存在(80 %)，大约只有10%的氮是以铵的形式存在。

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