It's hard work and LOUD

I have a system so I don't get the carpets too wet

do 3 passes with shampoo then go to another spot and do 3 passes there, then go back to the first as it's had a little time to soak and draw up the shampoo, I do at least 10 passes and very slowly to get as much water and dirt out as I can

I found a tank of water shampoo mix ( about 1.5 litres) will do about 1.5 m sq

sometimes I just do the walk in areas where the carpets are dustiest