what do you lot have yours set to ?
It all depends on your own system.
With the hose removed from the pump outlet, you should be able to turn the outside dial all the way up to boost.
When you put the hose back on the pump outlet, the rest of your system comes into play. Length of hose, diameter of hose, coils on your reel, connector's. All these cause a resistance to the flow.
If you pour liquid through a funnel, the amount you pour in cannot be greater than the funnels ability to let it through. if you pour too quick the funnel will overflow.
Your system in enclosed so cannot overflow, so pressure builds up. When this pressure becomes higher, it has the same effect as you cutting off the flow at the pole. This is why on some systems, you can only run up to the 12 o'clock position. Any higher and The Varistream will stop your pump. As some pressure is released, the pump comes back on. Rapid on, off, on, off, is known as cycling.
The little blue dial inside is in effect a variable pressure switch. This switch works by sensing the demand the pump makes on your battery.
The correct setting for this dial will depend on your own system.
As has been said above, one increment at a time adjustment, is the best way to find the right setting for your own system.
Many of you will already know all this, but it may help new Varistream users to understand how the thing works. Dai