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This doesn't get all of the area in, I am stood with maybe a third of it behind me, it took me about 20mins to do the lot including turbo nozzle on the edges at the end. My friend actually timed me.
On the topic of 21 lpm pumps i have an observation after a couple of days use..The first job i did i used a bladder tank and it was fairly powerful but i was using a turbo nozzle ith .5 orrifice as opposed to the suggested .65 so i was restricting waterflow by using a slightly smaller hole so i wasnt getting it maxed out.
I then did a approx 70 sqm drive which would normally take about 90 mns and i was done in under an hour however i just did it from there exterior tap and the difference from a bladder fed hose was massive. I then did another job where the water pressure was fantastic out the tap so i did the same again and the power and flow was incredible..I was literally blown away ..
Now i appreciate all water pressure is not the same job to job and i have only done a couple of day with it but it performed much better out the mains..Now it might be that the nozzle size is restricting it just enough and a bigger nozzle it may not work so well . I know it will decrease the life of the turbo nozzle but the amount of time its saving far outweighs a new nozzle ..Im wondering if it will somehow damage the pump but to me it was underperforming out a bladder and that was with a 3/4 inch hose and 3/4inch non tapered filter..
There is also no way you can run a 21 lpm pump on a direct feed from a tap whithout knackering the pump. It's also naughty to do as the water company could fine you too if they found out as you are trying to draw more water from a tap than it can provide.
I have seen that video smurf and that was why i mentioned it was 3/4 inch straight through and not tapering at all .
It had me wee bit puzzled and got me thinking that maybe there is some benefit to having 2 water inlets after all. Dont get me wrong it was powerful with the buffer tank but it was a different beast out the mains.
I get what you are saying but would it not have the opposite effect if it was not getting enough out the mains as opposed to performing better with more pressure and flow rate.
As i said i wonder if the nozzle played a part because it wasnt 21lpm going through it...
I will try that and see if that makes a difference . The power etc was really good from tank so I think it was working fine tbh ..certainly more powerful than my previous 4000psi 15lpm it was just better out the mains.