RV Experience Sharing our experience about RVing

August 9, 2005

Macerator Use

Filed under: Uncategorized — donwood49 @ 5:39 am

We have a macerator that provides a means of draining our RV’s holding tanks when we’re at home and wherever the drain inlet is difficult to access. Our RV drain outlet is very low so we often can’t drain into the park drain inlet. We also have run across some parks that must believe water flows up hill since they place the drain inlet as high as our bumper on occasion.
A macerator is like a garbage disposer. They can be either permanently installed or portable. Ours is portable. It is attached to the drain outlet of our RV. The macerator requires a good power source. It uses about 20 amps. Since it would be used regularly, I installed a pair of #10 wires to a power connector that terminates next to the drain outlet. The macerator is carried in a plastic case for easy, neat storage. To use the macerator, just attach it to the drain outlet like a drain hose. Connect the power cable. Attach the drain hose to the macerator outlet. I have a 75′ long 5/8″ hose with shutoff valves and caps for each end of the hose. Remove the caps and attach the hose. Secure the male end of the hose at the drain point such that it won’t move when the flow begins. Use a weight or good old duct tape. When the hose is attached, the valves on each end can be opened. Hook up a second hose to the water faucet and attach it to the hose inlet on the macerator. Turn on the water and the macerator to check that the water arrives safely to the drain with no leaks (I use a short 10′ hose that I normally use for cleanup of the conventional drain hoses). If it does, turn off the water faucet and macerator and open the black drain valve, then turn on the macerator. Check that all is going where it should. When the black tank is empty, close the black valve and open the gray valve. When the gray tank is empty, close it’s valve, turn on the faucet to add clean water to purge the pump and drain hose. When the hose has cleared, shutoff the macerator. Be sure not to run the macerator without liquid to pump. Coil the drain hose as you drain the water from it then close the valves on the hose. Install the hose caps. Wipe down the macerator and place it back in the case.
The shutoff valves on the drain hose are for emergency shutdown in case something goes wrong.
We haven’t yet used it where we are dry camping. If you use it where there isn’t a good source of clean water to purge the macerator and hoses after use you would end up with a dirty macerator and hose to store. I’ve always just used the conventional hose for those locations. The macerator is saved for use where other means won’t work as well.
We got the macerator kit from Camping World when they had a good sale. I think it was about $170 on sale but is usually less than $300.
Macerator System Storage Boxes Macerator System Storage Boxes Opened
Above left are the closed storage boxes for the macerator and the drain hose respectively. Above right they are open. It’s kind of important not to mix-up fresh water and drain water hoses. All the drain water hoses are gray, both the one above that is used on the macerator outlet and the hose used to connect water from the faucet to the macerator. The later hose is used to clean the conventional 3 inch hoses as well. All fresh water hoses are white and never used anywhere near the drain system not even just to extend the water toward the macerator. Not shown is the anti-syphon coupler that is part of the connection from the faucet to the macerator.
Macerator Hose Couplers Macerator Pump
Above left are the drain hose couplers and caps. Above right is the macerator pump. The red button at the end of the cable is the push on/push off control. It’s kind of cumbersome. I’ll probably replace it sometime with an inline switch without all the extra wire. The blue at the top of the pump is a coupler with valve where the clean water attaches. It can be turned on to clean out the drain line and to clear the impeller is it clogs. At the bottom center of the macerator is where the drain hose connects.

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