If the water pressure is very high, it is preferable to install a pressure reducing valve between the programmer and the delivery pipe.
You can also control the pressure by closing and opening the key, but this last step is more labor, so we recommend having a pressure reducer.
Why we recommend buying a pressure reducer?
When the water comes to too much pressure can disconnect the pipes causing flooding, so it is advisable to buy a pressure reducer.
Some pressure reducers already carry a built-in filter.