The coffee is very slow coming out.we have decalcified the machine many many times,taken the grindchute assembly out and cleaned it,and now we are running out of options Please help

Coffee coming out too slow could be a number of problems.
I'd start with the grinder and make sure it is set to the right settings. If the coffee's too fine it will cause the coffee to come out slowly.
Next it could be a dirty brew group. The internal part of the brew group has a glass ball inside of it which is used to during the infusion process. Take the ball out and make sure that area is all clean.
Restrictions in that area can cause the coffee to come out slower.
Your next possible scenario is the pump. Vibratory pumps do go bad from time to time, and a bad pump would cause the coffee to come out slow.
If its a newer saeco machine with the J style boiler, it could be clogged due to lack of descaling.

Slow coffee can be caused by any one of these issues. Usually it is the first one.... the grinder settings.
A tip is to never go under the 3 setting under any saeco machine as the machines for some reason cannot handle anything lower all that well.
Also remember these machines are ment to produce an "espresso like" coffee, and not traditional espresso. They are not capable of producing espresso that you would otherwise be able to make in a traditional handle machine.
Hope this helps.