Arrived to home for low pressure. Sean was out here to install customer supplied whole house filtration system. Information I gathered was about 2 weeks after install customer noticed substantial pressure drop when more than one fixtures are use at the same time. Bypassing the system brought pressure back. My concern is that if the filters are clogged, it only took 2 weeks for that to happen. Swapping the filters may solve the problem in the meantime but my opinion is that this same issue will occur not long after swapping filters. Spoke with Sean and we both agree that system is not adequate for the amount of fixtures in the home. Filtration system should be reanalyzed and specs looked over to find out hat system can handle. Waived 59 Customer asked to bypass system until Sean comes next week.