This show that the membrane is being clog >50% looking at the water so Dark. Hence filtered water out from kitchen tap In the end become <1 bar. The piping in the video very straight forward  what I mean it only meant flushing. membrane have to perform Flushing twice a day and Backwashing 2 week once. If Water cut then when water start supplying nextday perform Backwashing  and flushing.  Generally POU can't withstand more than >2.5 bar those joint will start to leak and the fact is The more Slower water passes thru The POU Catridges the More reducing Chlorine % can be achieved Hence 1~1.5 bar is just good enough. If don't believe try to connect the main Pipe to POU 6 catridged and use filtered water to cook rice. Another One reduce the pressure to <1.5 bar and connect to POU 6 catridges and use filtered water cook rice. In the end compare the freshness cooked rice once cool put in the fridge and cover it.  You will  find the one that connect with Main piping to POU 6 catridges <1.5 bar is for more superior in keeping the freshness of the Cooked rice after several day. I use Membrane system for 2.8 yrs and  POU a basic  6 filter catridges and I do analysis cooked rice can withstand the freshness up to >1 week.