Rainsoft water softeners are popular choices in removing the particles and hardness from your house's water supply. Hard water has high concentrations of mineral ions which can effect the taste of the water. Hard water cannot hurt you but can lead to build ups of grime in your pipe and even degrade older types of iron pipes. Installing a water softener can be done by anyone but it will take some time and quite a bit of work.
Turn off the water going into your house by locating the water shut off valve. It will be a large valve located somewhere on your water inlet pipe. Turn the valve handle all the way shut which will be indicated by not being able to turn the handle anymore. Find a faucet and turn the water on, the water will not come out if you have properly shut the water off.
Place your water softener by the pipe that connects the water inlet to the water heater. Turn the inflow valve on the water heat off so that no water flows back. Put on your safety goggles and work gloves at this point as you will be using the reciprocating saw next. Place a bucket beneath the pipe connecting the inlet valve to the water heater to collect any water drips.
Turn the reciprocating saw on and place the blade on the PVC pipe between the water heater and the inlet valve. Saw through the pipe while being careful not to cut any other pipes or wires nearby. Repeat this cut on the pipe by the water heater inlet valve so that the pipe can come free. Pull the pipe off and place it in the bucket.
File down the raw edges of the PVC pipe left in the valves on either side. You do not need it to be mirror smooth, you just want to remove any debris that might come loose when you turn the water back on. Wrap the sides of the pipes sticking from either valve in caulk tape. Three layers will do.
Squeeze the inlet pipe mouth of the water softener over the pipe and then secure it with an o-clamp. Tighten the clamp with a flat-head screwdriver, rotating clockwise to tighten. Do not use a power driver as PVC can be cracked. Squeeze the outlet pipe mouth of the water softener on the PVC pipe sticking out of the water heater inlet valve and secure with an o-clamp as well.
Caulk around the edges of the joins on each PVC pipe. You cannot use too much caulk so just coat it. Plug the water softener into a grounded outlet and then turn it on via the switch on the side. Open the water valve on the inlet first and then open the valve on the water heater. You will now have soft water.