I would put those machines on bypass and see if your pressure is better. If its 2 units that you have,the first could be an acid neutralizer that raises the Ph in your water so its not acidic. The second is probably a softener that removes water hardness,iron and manganese. I would try to get more information on them like the brand and model. Gary can be a real big help to you when it comes to water treatment. I'm sure hell drop in with some suggestions when he reads this but i would suspect the treatment system as the culprit to your low water pressure.