[quote=flu]
Also, regarding getting a water filter. I’m still using bottled water, but considering switching to filtered water. However, I have heard that a lot of the filtered water system use anywhere from 1:1 to 1:4 ratio..That is, to have 1 gallon of filtered water, it takes 1-4 gallons to run through the system. True or false? If true, does the water just get sent out through the drain?[/quote]

If you use Brita pitcher there will be no loss. If your refrigerator has the filter option you should be getting close to 0% loss. No idea how whole house filtration system works.