"Regular pressure lances clean patios but leave stripes and blast out grouting which splatters walls & cars nearby.
The T400's pressure adjustable rotating nozzles minimise grout lift and clean over a 12" width at one pass. The yellow shroud and tough bristle skirt minimises splashback - I did the muddy patio in jeans & trainers without any spray on me. Just needed to brush the lying water & residual mud onto the garden afterwards.
The shroud allows cleaning up to about 1" from a wall or other obstruction, whilst the single nozzle at the front gets into corners.
Best way to use the tool is back & forth (like a vacuum cleaner), not side to side. Works on garden tables without lifting the grain.
Robust construction. First use, but seems well designed and constructed. Not cheap however I am pleased I bought this large model and now regret not having bought it years ago."