How to Install a Reverse Osmosis Water Filter, Part 2 How to Install a Reverse Osmosis Water Filter, Part 2

What You'll Need
Reverse osmosis system kit
Drill
Adjustable wrench
Open-ended wrench
Razor to cut tubes to 1/4 inch
Propane torch
Thread seal tape (plumber's tape)

A reverse osmosis water filter system is a popular choice in modern households for maximum water purification. There are a variety of steps and features within these systems that purify the water, such as carbon filters that eliminate unwanted odor and chlorine and membranes that eliminate arsenic, lead, mercury and other heavy metals.

Step 1 -- Installing the Faucet

By this time, you should have installed the filter assembly on the wall and placed the storage tank in an appropriate location. In order to mount the faucet, drill a hole through the sink’s counter. This will be an easy process if the sink is made out of stainless steel or plastic. In the case of a cast iron sink, drill a hole in the counter next to the sink instead.

Step 2 -- Faucet Connection to the Filtration Unit

Shut off the water supply before making any connections. Your kit will include a white spacer and a jamb nut. Place the spacer over the faucet’s shank (the lower half) and tighten the nut with a wrench. Now use the blue-colored water supply line and attach it to the push-in fitting. Cut this tube to ¼ inch and connect the faucet to the filtration unit. The faucet has to get connected to the post-filter with the carbon membrane. Use the manual to recognize the area if you are unsure.

Step 3 -- Connecting Storage Tank to Filtration Unit

The post-filter unit mentioned in Step 2 will have a T-junction. The second valve is for connecting it to the storage tank. Again use a ¼-inch tube to connect the post-filter to the valve on the tank. Tighten the nut firmly onto the valve.

Step 4 -- Cold Water Supply Line and Compression Fittings

Remove the shutoff valve already placed on the cold water supply going to the sink. Do not connect it to the hot water line since that will damage the membranes. Use two wrenches for this purpose, one to hold on to the valve and one for the pipe. However, if the pipe is small, one wrench will suffice. In the case of a soldered valve, use a propane torch to dismount it from the pipe. Slide the compression nut onto the copper pipe, followed by the compression ring. Wrap the pipe with thread seal tape before sliding the new valve in. Now mount the ring and the nut onto the new valve. Fix the nut and the ring on the other side of the valve as well, where it will get attached to the filtration unit. In order to avoid over tightening, tighten all the fixtures with your hand. There may be a saddle valve instead of the compression fitting, which will be mounted onto the cold water line. In that case, the green pipe from the filter as well as the black pipe from the drainage will be pierced onto the cold water pipe.

Step 5 -- Water Drainage Pipe

You can remove wasteful water by disposing it into the sink drain pipe from the filtration unit. Connect a pipe from the filtration unit to the drain and insert a valve on it to prevent backflow. Flush the entire system at least twice to remove impurities. 

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