Pros
Use washing machine hoses instead of plastic supply lines.
For supply, it is copper and galvanized iron. For waste, ABS (plastic) or cast iron.
Because it used to be cheap and the best material. In the last 10 years more homes are going to plastic pipe.
New York, as NY has the most high rise buildings thus we have the most copper and our water supply does not attack copper as other states water supply can
There are various companies that supply plastic chairs. One can find different types of plastic chairs by looking for event rental stores or companies.
You used the WRONG plastic - should have used PEX, not glued plastic for water supply line in a home !-If it was my home I'd remove it and replace with PEX.If you don't you may have to run water through for about a month to get rid of that taste.
More than likely you'll have to cut the supply pipe off behind the valve or loosen the large nut on the valve which would release the valve from the compression ring...then just replace the valve, if that is what you are attempting to do.
Filter
Supply for copper from outside will decline, Demand for copper locally will increase. More labour needed.
1/2 inch copper/plastic pipe is standard for water2" water main then the branches are sized to properly supply fixture unit demand with out excessive velocity which can cause erosion and hydraulic shock
One can get plastic drinking cups from most supermarkets, party supply stores and even from home and office supply stores. Walmart has clear plastic cups. The Party People has clear, yellow, red and silver plastic cups. Redds Cups has red plastic drinking cups.
Many experts agree that China is the country that uses copper the most. Currently China's demand for copper is higher than the supply available.