I own a condo with the following: 2-Tub/Shower Combo's, 2-Toilets, Dishwasher, Kitchen Sink, 4-Bathroom Sinks, 1-Patio Faucet. My unit is upstairs with an identical unit below (same fixture count). Each unit HAD it's own 3/4" feed with seperate shut-off vales about 30' away at the common meter box. HERE'S the problem. The downstairs unit had a leak in their line under the slab and after two days of attempting to locate and repair the line the plumbers deceided to abandon the downstairs feed and tee into our 3/4" feed so now both units share one feed, esscentially doubling the number of fixtures on one 3/4" line. Additional am I correct in thinking that because I am upstairs and if both units are using water, the downstairs unit gets more pressure? And ideas would be helpful!