I have a well that supplies are water we put a filter on the line that comes into the house and hot water heater the pressure is very low you cannot run a washing machine or flush the toilet while showering or using another faucette in the house the water then drips out is the filter causing this? We have 3/4 inch pipes leading in and out from the filter and from the pump. How can I increase the water into the house so I can use more that 1 faucett or flush the toilet and still have water to the sinks?

Did this problem begin immediately after installation of the filter?
Do you have faucets before the filter? Maybe outside between the well and before the house that maintains pressure if more than one is on at the same time?
Is the pump you mentioned at the well or after the filter?
The well should have a pressure tank with a gauge and pressure switch you might observe for proper operation.
If these check out okay you might check your filter documents to see if it has an adjustable pressure switch and gauge with recommended settings.

On a Square-D Pumptrol pump pressure switch, Turtn the larger spring,(#1) clockwise to raise [both] cut-on and cut-off pressures.

In other words, adjusting the pressure on this spring shifts the whole operating range of the switch up or down, but keeps the difference between cut-in and cut-out the same, whatever it happens to be (typically it's about 20 psi from the factory.
Turn the smaller spring.(#2) clockwise to raise the cut-out pressure only.
In other words, adjusting the pressure on this spring shifts just the pump cut-out pressure up (clockwise) or down (counter-clockwise).
This should give you the pressure you desire. Good luck, Tom