Even without the varistream you do have a little scope for varying the flow of water without comprimising the pump.
Up until I've always used fan jets and got on great with them, but the pressure needed to get a decent flow needs to be fairly high, or rather not the pressure but the flowrate, and that also depends on the jet itself I might add.
For some time now I had dispensed with the return setup on the pump box, preffering to let the water blast out at full pressure.
All well and good, everything suited me perfectly thank you very much, but I was starting to go through a lot of water on a busy day.
Last week I upgraded to to a superlite pole and brush from Gardiners, the brush is fitted with 2mm fan jets, but the flow of water from my pump was way too much!
Alex had fitted the pole hose with a valve, so I could of course restrict the flow of water should I wish too, I was worried that by restricting the flow my pump would start to stutter, shutting off and then starting again as maximum pressure was reached.
If I only open the valve a little then that is exactly what happens, but I found that I was able to turn the flow down to just the amount I needed, and the pump just kept working smoothly, as a result my water usage has dropped markedly.
As a result of which I'm now very impressed with needle jets!
Nowt wrong with fan jets, but for my own situation, the needle jets combined with the lightweight superlite brush works a treat.
And yes, with all these pumps, when you shut the flow off the pump cuts out and stops when it reaches maximum pressure, when you open the flow again the pump starts up again.
what you don't want is a stuttering pump, cutting in and out constantly as you'll damage the pump, usually the pressure switch burns out.
Ian