... vanes that reduce recirculation and seal contamination. Cast in impeller threads require no inserts or nuts.One ... big solid particles. 3. It is widely used in the dredge of silt, ore pulp, coal liquid, ... indoor vertical installation,8. Don't install in place with vibration or shock Application: 1.Absorb the sand ... , lake and sea.2.Absorb the silt and sand in the river, lake, sea, reservoir , pound , ...