... we supply is D18,D20,D25,ect. The size length will vary atyour request.The magnetic field strength can reach at a ... with rust, swarf or other metals attracted to magnet rod, it willbenefit from passing through the powerful simple filter (magnetic ... , increase water flow, reduce the power consumption and maintenancecost. Protect against the damage of equipment, prolong the life of equipment. 3. ...