Yes. I covered the entire house. It makes it more difficult if u have a center island water faucet away from refrigerator. So I put the reverse osmosis system under the sink. I take water from RO in glass bottle and keep in refrigerator. I also have high TSD so wanted the RO to get rid of that at same time. The cupboard above the refrigerator has filter system installed with .1 micron filter so the ice and the water from refrigerator has no bacteria. So if u do not care about RO you can actually get the filtration system installed above refrigerator so water feeds thru filter into refrigerator. In the garage I got UVC nano light 254N Which alters DNA of the bacteria before it gets to your shower heads and water heaters. Since we do not know where the source is whether water or soil and I have swimming pool I also bought a 254 UVC light for swimming pool. This will make sure no mycobacterium will live in my pool from any dirt. My pool circulates constantly and UVC light has also made water crystal clean. Before I did this, I had my water testing in my pool, outside jacuzzi , kitchen sink and from shower head. No mycobacterium was detected by PCR testing. Hard to find a lab. I sent my water to lab that specializes in it in Kentucky! I had Leaf Home do the RO, filters above refrigerator and UVC light in garage. It is MUCH cheaper to do it this way vs your entire home . U can get ur pool company to install UVC light if u have a pool