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How to Install a Macerating System

To install a toilet in an area that doesn't have plumbing, think about using a macerating system. These step-by-step instructions show how to easily install a macerating system in a home.

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Step 1: Prepare the Macerating Unit

With a macerating system, the bowl empties through a discharge line (Image 1) into a tank. The tank houses a pump that macerates, or breaks up, the contents from the bowl then pushes them out.

Prepare the macerating pump unit by pushing the flapper check assembly into the opening (Image 2). Make sure that the flapper assembly faces in the same direction as the elbow.

Push the elbow onto the connection and secure it with a clamp.

Step 2: Tap Into the Vent

To tap into the vent, use a reciprocating saw to cut through the pipe. Put down a drop cloth or use a bucket to collect anything that comes out.

Remove about a 12" section of pipe.

Clean both ends of the old pipe then put rubber adaptors onto the old pipe.

Step 3: Connect the Adaptors

Prep up a 1" and 1/2" 'Y' with short pieces of PVC so that they'll span the gap in the pipe; connect the rubber adaptors.

Put the 'Y' into place and slide the adaptors over both ends, then firmly tighten down all clamps to avoid leaks.

slide adaptors over both ends of pipe

Step 4: Screw the Adaptor Into the Cleanout

Next, remove the cleanout cover on the sewer line (Image 1).

Note: Make sure that no one is using the sink during this process or sewage could come out of the open pipe.

Once the cap is off, set up a threaded male adaptor with a 3/4" reducer. Coat the threads on the male adaptor with Teflon paste (Image 2) and screw it into the cleanout. Use a plumber's wrench to make sure the adaptor is snug.

Step 5: Attach the Bowl

First, connect the accordion seal to the bowl of the macerating system then anchor the bowl to the floor using the anchoring holes.

Step 6: Attach the Unit to the Sewer Line

Note: Before hooking up the toilet to the macerator, it's a good idea to hook up the macerating unit to the sewer line. To do this, run a discharge line off the flexible 90 on top of the macerator pump. Keep in mind that this line is called a pressure positive line, which means when the pump kicks on, the line will be charged with pressure. Make sure the system is rated to withstand the pressure.

Step 7: Connect the Pipes

Set up lengths of 3/4" PVC pipe and a 90 to go out of the wall.

Then, insert the pipe into the flexible 90 on the macerator and firmly tighten down the clamp.

Rotate the pipe parallel to the wall then drill into the wall at the end of the pipe.

Adjust the length of the discharge line if necessary and glue it to the 90. Then put the pipe through the wall.

Step 8: Run the Discharge Line

Next, continue running the discharge line and connect the ball valve (Image 1) as close to the macerator as possible.

Then, continue running the line (Image 2) trying to minimize the number of 90 degree turns with 45's where possible.

Also, make sure that the line is on a slightly downhill angle to where it taps into the sewer.

Use pipe hangers (Image 3) to secure the line and if the pipe is in a cold area, make sure to insulate.

Step 9: Run a Vent Line

Note: In North America, it is a requirement to run a vent line from the macerator to the outdoors. This will help prevent what's called 'air lock' and will keep the pump running smoothly for a very long time. There may be an existing vent in the house to tap into, or a local vent that goes up through the walls and outside through the roof may need to be run.

Start by blocking off the breather opening in the macerating unit with the two supplied caps.

Use a reciprocating saw to cut the lid off the dome then slide the supplied accordion connector over the lip. Clamp it down securely.

Install a 1" and 1/2" street 90 into the connector. Mark where the 90 intersects with the wall, and remove the 90.

Use a hole saw to cut through the wall. Put the street 90 back in and secure it with a clamp.

Now, continue to run 1-1/2" PVC to connect into the tap made earlier. Use PVC hangers to secure the line.

Step 10: Run the Cold Water Line to the Toilet

After turning off the water and relieving the pressure, use a pipe cutter to cut into the water line.

Remove about 2" from the water line and install a 'T'.

Attach a short piece of pipe to the 'T' and then add a ball valve.

Use standard soldering techniques to extend the line and connect into the pipe that was put through the wall earlier.

Step 11: Secure the Connections

Start by capping off any ports that will not be used.

To set up for a sink connection, cap off a piece of 1-1/2" PVC and connect it into the supplied accordion connection.

Secure all connections with clamps.

cap off any ports that will not be used

Step 12: Install the Toilet

To install the toilet, set the clamp onto the toilet's discharge outlet (Image 1).

Next, place the bowl in front of the macerating unit and pull the accordion gasket all the way onto the discharge outlet (Image 2).

Carefully inspect the gasket and make sure that it's even all around and that the clamp rests over the edge of the gasket, then tighten down the clamp.

Once the bowl is over the holes in the floor, slip the china protectors over the lag screws (Image 3).

Then, tighten the lag screws being careful not to over-tighten them. Snap the bolt covers into place.

Step 13: Make the Final Connections

Install the toilet tank by lining up the gasket and tank bolts (Image 1). Again, be careful not to over-tighten.

Install the seat.

Attach a stainless steel flex line from the bowl to the valve (Image 2) and turn on the water to check for leaks.

All plumbing connections are completed and it's time to plug the unit in. Turn on the water and test out the system.

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