On the TRAC TRONIC and ECO versions of the E81, solution flow rate can be controlled from the multi-function display on the control panel.
Pressing the ‘+’ or ‘-’ buttons determines the amount of solution dispensed to the brush. Flow rate is clearly displayed by dedicated LEDs. When all five LEDs are lit, the E81 is dispensing an impressive maximum flow rate of 5.3 litres/minute.
On the TRAC M mechanical version of the E81, solution flow rate can be controlled mechanically using a lever that acts as a tap.