Actually this is made for small tiles and I have the large ones so I cant clean more than one at a time but I dont care! This cleans so well with not much effort. I have knee issues so my grout had 4 years of black dirt buildup. I just put a brush on each end of the head and alternated back and forth. Cleaned a large kitchen in half and hour using Vinegar and water in a spray bottle with 2 or 3 drops of dish detergent! Maintenance should be a breeze. Cant beat the price either!