Hi
Yes I'd go along with that, but the water broom is great for swilling away the stuff your rotary cleaner has freed off. It is not really a cleaning tool in its own right. (I run mine at idling speed after the clean, you just push it along and sweep the c**p into a drain or somewhere). I got a 22"whirlaway from Merrill Fox in the states and a 4-nozzle broom, all cheaper than here even with carriage (the $/£ rate is pretty good just now, he is great to deal with. Also I toyed with the idea of putting a more powerful pump in my truckmount but went for a power-washer off ebay ( have a look at Jetmac Systems in Co. Down, they do a whole range) but I have found that cleaning anything with a lance is very messy and long-winded but a rotary will not cope with serious black algae or gum, even with 3600psi. You can get little plastic shrouds from Kleeneze catalogue to clip onto your lance - not tried them though. I would say you need at least 300psi and 16lpm flow rate to do a decent job but open to correction. Lots of posts here to go through which help. All the best, Eric