Aluminum alloys Blades high defines casted blades with very less weight, Non- corrosive material & longer life. reduces bearing load, reduce noise level. power consumption Aluminum blades less weight hence consume less power up to 25% than MS blades . Impeller having less weight hence starting torque is less, reduces ele. motor size & give longer life of motor.... special steel shaft This type shaft reduces the risk of any breakdown stainless shasft will be provided at extra cost.