由于收尘面积小，滤纸易堵塞，只能过滤较大的灰尘，过滤效果不佳。
Because the area is small, to collect dust filter paper easily blocked filter, can only large dust, filtering the effect not beautiful.
国内现有的一些排肥器，在排施易吸湿、潮解的粉状碳酸氢铵化肥时，多数容易引起架空、粘附、堵塞等现象。
When feeding the moisture-absorbing and moistened ammonium bicarbonate, the most of available fertilizer feeders are liable to make the fertilizer bridging, adhering and blocking up.
由于收尘面积小，易堵塞，只能过滤较大的灰尘，过滤效果很差。
Because the area is small, easy to collect dust jams, only larger dust filter, the filtering effect is very poor.
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