Grinding submersible pump in cast-iron for sewage water, 2 poles, 0.75kW,
Max head: 17.5 m,
Max capacity: 170 L/min



Grinder pumps are provided with a cutting system able to chop up paper, little ropes, leather or other fibrous parts present into the sewage water. The grinding pumps are required when the delivery pipes are so narrow that a solid part could clog the pipe itself or when it is needed a pump for sewage water but with an high head. The model GRINDER 100 is always provided with a small control box at the end of the cable including a manual reset amperometric protection: this kind of protection is necessary for grinder pumps to avoid that the motor can get burnt in case a too hard solid part blocks the cutting system.


The GRINDER 100 is usually installed into houses' pits to pump the domestic sewage water. This model cannot be used to pump water containing stones or hard solid parts (e.g. pieces of wood or metal) or when the content of solid parts (such as paper) is too elevated..

Operation conditions

Max liquid temperature: 50 °C (122 °F)

pH: 6-10

Max density < 1100 kg/m³

Max immersion depth: 5m



Performance curve:


Model                                                Head (m)                                             
2 4 6 8 10 12 14 16 18
GRINDER 100  L/min 170 159 146 130 110 88 62 30   0  
m3/h 10,2 9,5 8,8 7,8 6,6 5,3 3,7 1,8 0
L/s 2,83 2,65 2,43 2,17 1,83 1,47 1,03 0,50 0



Technical characteristics:

Outlet 2" - DN 50 vertical threaded
Solid passage ---
Cutting system Composed by a fix cutting ring and a rotating knife
Impeller Back open impeller "vortex" type.
Mechanical seal Double mechanical seal in oil chamber. The lower one in silicum carbide / silicum carbide / NBR, the upper one in silicum carbide / graphite / NBR + NBR oil seal.
Motor Dry. Insulation class: F
Motor protection Automatic reset built-in thermal protection + manual reset in an external control box at the end of the cable

The pump is supplied only with float-switch


10 meters cable H07RNF 3G1 with control box at the end of the cable and with plug

Capacitor 30μF - 450V
IP 68



Electric characteristics:

Model Power   Nos. poles R.p.m. Voltage Ampere
GRINDER 100   1.0 HP - 0.75kW 2   2850    230V/50Hz/1  6,1 A




Cutting system       Stainless steel AISI 440 tempered                                       
Impeller Cast-iron GG 20                                                             
Pump cover Cast-iron GG 20
Motor case Cast-iron GG 20
Pump body Cast-iron GG 20
Pump support Cast-iron GG 20
Motor shaft Stainless steel AISI 420
Packing set NBR



Weight and dimensions:


Model                  Outlet                         Dimensions (mm)                    Weight  
female threaded A B C D E (kg)
GRINDER 100 2" - DN 50 460 290 295 255 490 27




Connections Professional straight brass connection 2" in three pieces
Standard straight plastic connection 2" in one piece (supplied with the pump as a standard)
No-return valve Professional ball check valve threaded 2" in cast-iron
Float-switch 10 or 20 metres cable float-switch to be connected to an electric board in case it is not possible to use the standard float-switch connected to the pump
Electric board The model GRINDER 100 is already supplied with a small control box at the end of the feeding cable including a manual reset amperometric protection. An additional electric board model F5-0.5/3-1 is necessary only in case a 10 metres cable float-switch must be used instead of the standard float-switch connected to the pump.



GRINDER 100 ENG - REV. 2.0 - 03/12/2018

Comex Srl Società Unipersonale, Via delle Industrie, 42 - 31057 Silea (TV) - ITALY
P.I.: 00345210264 - Cap. Soc.: 50.000€ i.v.