Does anyone no why I would have low water pressure, hot and cold, after draining my system and installing a new water heater. The pressure switch says I have between 30 & 50 psi, but there is no way. I do have a pump that pumps in a product to bring the acidic ph down.

Is it in all bathrooms or in one plumbing fixture only ?

Have you allowed the air to get out of the system by running water for awhile? Check your pump's associated air bladder pressure with a tire gauge to see if it is normal.

The pressure switch does not tell you how much pressure you have. You need a gauge for that. Granted, the switch is set, in your case, to 30/50, but it might not be functioning correctly. Do you have a gauge?

Yes it is throughout the entire house. Happened after draining the system and installing a new Water Heater.

Yes it is throughout the entire house. Happened after draining the system and installing a new Water Heater

The main water valve where you shut water off is probably not opened all the way. If it is a gate valve, the gate may have come unscrewed. Check the water volume and pressure coming from boiler drain on the well tank to see how that is. Also check outside spigots if they are on a separate line.
RJ