Sunday, July 3, 2022


Wife questions need for RV macerator pump

Dear RV Shrink:
We live in our nice fifth wheel about nine months of the year. It came pretty well loaded with amenities, so we can camp with or without hookups. My husband, probably like most men, likes gadgets. I don’t mind him buying things we will use a lot or that can make chores more convenient, but I don’t think we have to keep up with the Joneses.

He saw a guy at the dump station with a grinding pump that allows black water to go through a garden hose. My husband thought that was the greatest thing since sliced bread. He now wants to spend a couple hundred bucks so he can grind up stink and put it through a smaller hose.

He hasn’t been very convincing as to how often we would need this item. We have been RVing for 30 years and we haven’t needed one yet. Should I humor him and go along with this foolishness, or hold my ground? —Black water puree in Poughkeepsie

Dear Black Water:
It sounds like you two discuss what goes into your budget and what does not. If your husband really thinks he needs a macerator pump he will just have to sell you on the idea.

Many rigs have them. They are convenient if you have to move black water a distance. Many people use them at home to dump into a home septic system. They are slower when you are at a dump station where a three inch hose is convenient. Most require 12V power or a water source to run.

There are many things on your rig that are not absolutely necessary. The two of you will have to decide if this is an investment you think would be beneficial. I would suggest checking Craigslist and eBay for a unit that someone else has already bought and then decided they didn’t need one more thing to haul around. Their investment loss will be your gain, until you decide you really didn’t need it either. —Keep Smilin’, Richard Mallery a.k.a. Dr. R.V. Shrink

Can’t get enough of the Shrink? Read his e-books, including the Book 2 in his two-book series: Dr. R.V. Shrink: Everything you ever wanted to know about the RV Lifestyle but were afraid to ask or check out his other e-books.

##RVT914 ##RVDT1352


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1 year ago

I have one and use it weekly if you are somewhere you can use the 3″ hose use it it’s fast and simple. The 12volt unit works well to pump up hill into the “honey wagon” I have. It is slow and can only run 15 minutes at a time it can take 30 to 45 minutes to get a clear rinse then there is the 2 52 gallon grey tanks. If you moochdock at friends and family where you “need to empty into their sewer/septic” or you are in a situation like mine where you are stationary (temporarily living with no way to dump otherwise) I wouldn’t have one plus it collects hair which has to be cleaned out occasionally. Hope that helps!

2 years ago

I have had a macerator for about 4 years. When you are boondocking and not in the vicinity of a dump station, it is so easy to pump into a barrel on my truck and drive to the dump. No packing up and moving the trailer. That said, using the pump does not allow for the “rush” of the flow from the black tank. Best investment I have made.

2 years ago

Two motorhome’s, two macerator’s. Would “never” use a stinky slinky😎. The newer Thetford macerators are “Turbo charged” meaning stronger very fast discharge compared to my 2012 Thetford Sani Con. The ability to clean the inside tank walls of the black tank with grey soapy water is also handy for cleanliness.

Tommy Molnar
1 year ago
Reply to  Clayobx

How do you get the “grey soapy water” into your black tank?

2 years ago

We have had both. Now have a macerator. Would NEVER go back to 3 inch hose. Macerator MUCH faster, easier, and provides more options for dumping.

jane shure
2 years ago

The 3 inch hose is a faster way to dump, the only faster way is to dump and let it run out on the ground. That is a socially unacceptable thing to do not to mention other reasons. I have found the hooking up the 3 inch hose to be a pain in the {bleeped} and it is far easier and cleaner to hook up a garden hose and I do not have to be near the drain to dump. In some cases I did not have to start up the motorhome and move to a drain. Needless to say I like my pump.

2 years ago

Totally wrong at dump station. Use the faster 3″ dump hose if you can!

The purpose of a macerator is when you can’t use gravity… I dump about 80% of the time at home, where waste has to go uphill into my house septic. For ME, the sealed pipe and pumping are requirements. But I use my normal hose at public dumpsites.

2 years ago

What has gone wrong with hooking up a tried a true sewer hose pulling the valve, stand for a minute kicking the tire nearest, unplug put away hose and along you go on your way. I’m with the wife too.
Having said that our rig has a WasteMaster system, It is truly a dream. I dump both gray and black in less than two minutes. No fuss no mess either because the WasteMaster hose is smooth inside no matter how short you leave it or how long you extend it – how they accomplished this I do not know, but it is nice.

2 years ago

I’ll side with the wife on this. I think those things end up complicating a simple task. You need to consider the maintenance and repair too- they’re not trouble free.

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