Liberty Pumps ASCENTII-MUW Toilet System Macerating Unit Onl

The Verdict

The Basement Bathroom Solution That Doesn’t Require a Jackhammer

If you’ve ever wanted to add a bathroom below grade—basement, walkout level, or a slab-on-grade addition—you know the problem. Gravity won’t cooperate, and tearing up concrete to tie into the main sewer line costs thousands. The Liberty Pumps ASCENTII-MUW sidesteps that entire nightmare. This is the unit-only version of their popular macerating system, meaning you supply your own standard toilet. It’s a smart approach for anyone who already has a bowl they like or wants to match existing bathroom fixtures.

What You’re Actually Getting

The box contains the macerating unit itself—a compact tank that sits behind your toilet—plus the integrated pump, macerating blade assembly, a 3/4-inch discharge line with push-fit connectors, and the control panel. You’ll need to supply the toilet bowl, wax ring, and your own venting. The unit measures roughly 18.5 inches tall and 15.5 inches deep, so it tucks behind a standard toilet without turning your bathroom into a science fair exhibit.

Real-World Performance

This is where the ASCENTII-MUW earns its keep. The macerating blade reduces waste and toilet paper to a fine slurry, then the pump pushes it through a small-diameter discharge line. The specs matter here: 39 feet of vertical lift and 150 feet of horizontal run. For context, that’s enough to pump from a basement up to a second-floor sewer connection in most homes. I’ve seen reviewers confirm this works exactly as advertised for below-grade laundry rooms and half baths.

The unit handles more than just toilet waste—it has two additional inlet ports for a sink or shower drain. That’s a genuinely useful feature for a full bathroom install, not just a powder room. The control panel gives you audible and visual alarms for high-water conditions, which is the kind of failsafe you want when a pump failure means sewage backing up into your finished basement.

Customer feedback consistently highlights one thing: reliability. As one verified buyer put it, “Installed in my basement two years ago. Zero issues, works every single time. Best money I spent on that remodel.” Another noted the discharge line flexibility made the install far less painful than expected: “The push-fit connections are legit. I had it running in an afternoon.”

Where It Falls Short

Let’s be direct about the tradeoffs. First, this is the unit-only version. You’re buying a $500-plus component and still need a toilet. If you don’t already own one, factor in another $150–$400 for a decent bowl. Some competitors sell complete kits, but Liberty chose this route to let you match existing fixtures.

Second, noise. Macerating toilets are never silent, and the ASCENTII is no exception. The blade and pump generate a noticeable whir during each flush that lasts 8–12 seconds. It’s not obnoxious, but if your bathroom shares a wall with a bedroom, you’ll hear it. One reviewer noted, “It’s louder than I expected, but honestly, it’s the price of having a basement bathroom.”

Third, installation isn’t trivial. While the discharge line is DIY-friendly, you still need basic plumbing knowledge for the venting and inlet connections. This isn’t a “plug and play” product. If you’re not comfortable with plumbing, budget for a professional.

Who Should Buy This

The ASCENTII-MUW is ideal for three specific buyers: homeowners adding a basement bathroom without breaking concrete, contractors working on slab-on-grade additions where sewer tie-in costs are prohibitive, and anyone replacing an older, failing macerating unit who wants a proven upgrade. It’s less ideal if you need a complete turnkey solution or if noise sensitivity is a dealbreaker.

FAQ

Q: Can this handle a standard toilet and a sink simultaneously? A: Yes. The unit has two additional 1-1/2-inch inlet ports for a sink or shower. Just be mindful of total flow—it’s designed for residential use, not heavy commercial loads.

Q: Does it need a dedicated electrical circuit? A: It plugs into a standard 115V outlet and draws about 5.5 amps. No special wiring needed, but the outlet should be on a GFCI circuit, which is code for bathroom installations anyway.

Q: What maintenance does it require? A: Minimal. Use toilet paper that breaks down easily, avoid flushing wipes or feminine products, and clean the macerating chamber occasionally. The unit has a removable lid for access, and most owners report years of trouble-free operation.

The Verdict

Buy it if: You need a basement or below-grade bathroom and want a proven, reliable macerating system that lets you keep your existing toilet. The 39-foot lift capacity and additional inlet ports make it genuinely versatile.

Skip it if: You want a complete out-of-the-box kit, need whisper-quiet operation, or aren’t comfortable with basic plumbing work.

The Liberty Pumps ASCENTII-MUW earns its strong reputation through dependable performance and thoughtful engineering. At 4.5 stars from 225 ratings, it’s the kind of product homeowners buy once and forget about—which is exactly what you want when waste management is involved.

Rating: 4.6/5

Where to Buy

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.