I have a Manabloc system installed in my house. I am experiencing low water pressure to every fixture inside the house. I am on city water and have checked the incoming water source and found it working with plenty of pressure. So the source is good. I also checked for leaks in the attic where the PEX lines are installed. This just happened a few hours ago. Had no water pressure problems earlier in the day. Any suggestions as to what might be the cause?

Do you have a water softener? Whole House Filter? If so, bypass and check your pressure again. If no improvement, leave in bypass and remove an aerator from a faucet and try again. Orange beads in the aerator? If so, you need a new softener.