I'd definately go LM instead of dry, the drying times will be minimal, result would be at least decent, and job time would be lower. If it was me, I'd forget about the granules, give Jamie cleaning systems UK a ring and get some Releasit in - if its the usual landlord stuff on the floor it'll be a cheap polyprop, you could use the Hydrox version of Releasit to brighten the carpet to give an even better impression too.