Why I Tell My Customers When a Netzsch Pump Isn’t Right for Them

Why I Tell My Customers When a Netzsch Pump Isn’t Right for Them

Here's something that might surprise you: I've told more potential customers not to buy a Netzsch pump than I have told them to buy one. And I'm not ashamed of that. In fact, I think it's the most honest thing I do.

Look, I handle fluid handling orders for a living. Been doing it for about six years now. In my first year (2019), I made a classic mistake: I assumed that because our technology was excellent, it was excellent for everyone. That cost one client roughly $12,000 in rework and downtime. I still think about that one.

The truth is, there's no universal "best" pump. There's only the right pump for your specific medium, operating conditions, and budget. And if I can't honestly recommend Netzsch for your application, I'll tell you. Here's why that approach works—and when it doesn't.

The 80% Rule: Where Netzsch Shines

Netzsch NEMO progressing cavity pumps are, in my experience, the right choice for roughly 80% of demanding fluid handling applications. The rotating positive displacement design handles:

• Highly viscous media (up to 1,000,000 mPas or more)
• Shear-sensitive fluids (food, pharmaceuticals, cosmetics)
• Multi-phase mixtures (solids, gas, and liquid combined)
• Abrasives (with proper stator material selection)

If your application falls into one of those categories—and if you're within the standard pressure, temperature, and flow range—then yes, a Netzsch pump is probably your best bet. I've seen these machines run for years with nothing more than routine maintenance.

I don't have hard data on industry-wide failure rates, but based on our five years of orders, my sense is that correctly specified Netzsch installations experience major issues maybe 3-5% of the time. That's solid.

But here's the thing: that other 20%? That's where the real conversation starts.

The 20%: When to Walk Away

My experience is based on roughly 200 industrial orders with mid-to-high budget clients. If you're working with ultra-budget segments, or if your application is genuinely outside pump design parameters, your experience might differ significantly. Here are the scenarios where I've learned to pause and say, "Maybe this isn't the right fit."

1. Extreme High-Pressure, Constant-Rate Applications

It's tempting to think you can push any positive replacement pump to its limits. But Netzsch progressing cavity pumps are designed for moderate to high pressure, not extreme constant-rate high-pressure service like some hydraulic systems demand. If you need 150+ bar at a fixed flow rate 24/7, you might be better off with a multi-stage centrifugal or specialized high-pressure screw pump. I recommended a TORNADO screw pump for a customer in exactly this scenario—because the NETZSCH TORNADO line is specifically built for demanding high-flow, high-pressure applications where a progressing cavity design would wear out too quickly.

2. Extremely Abrasive, High-Temperature Media Without Proper Stator Material

This one bit me early in my career. I sold a standard NETZSCH NEMO pump to a mining operation handling a tailings slurry with high quartz content. The pump worked for about three months before the stator failed. Cost us $4,200 in replacement parts and a week of downtime. The lesson: you can handle abrasives—but only with the right elastomer (like HNBR or FKM in some cases) and at reduced service life expectations. If the media is both abrasive and hot (above 100°C), you need to be very careful. In that case, I now specify a PCP pump (progressing cavity pump) with tungsten-carbide coated rotors and heavy-duty stators. Even then, I tell the customer, "Expect to replace the stator every 12-18 months." Honesty prevents problems later.

3. The "Cheapest" Option Mentality

People think expensive vendors deliver better quality. Actually, vendors who deliver quality can charge more. The causation runs the other way. If a client says, "I just need the cheapest pump that moves this fluid," I recommend a less expensive alternative—maybe a gear pump or diaphragm pump. A Netzsch pump isn't for price-sensitive, low-criticality applications. It's a capital investment. If your budget is tight, go elsewhere. Pushing a premium product into a price-driven decision is a recipe for resentment.

The Communication Breakdown That Changed My Approach

I said, "This pump is designed for your application." They heard, "This pump will handle anything you throw at it." Result? When the pump failed on a high-solids, high-viscosity batch that was outside spec, they blamed the pump—not the application.

We were using the same words but meaning different things. Discovered this when the client called, angry, saying I had "guaranteed" the pump for their entire process. I had never said that. But my enthusiasm had implied it. Now, I explicitly list what the pump cannot handle. I write it in the quote. If the client doesn't read it, that's on them, but I've done my part.

Responding to the Obvious Question

"But aren't you losing sales by telling people not to buy from you?"

Short answer: yes, in the short term. In 2022, I turned down a $17,000 order because the application was genuinely wrong for a Netzsch progressing cavity design. That hurt. But a year later, that same client came back with a $55,000 project—because they trusted that I'd be honest.

Trust is a currency that appreciates over time. Each honest "no" earns interest. Each dishonest "yes" compounds into debt.

The Bottom Line

Netzsch equipment is excellent. But it's not universal. The best thing you can do for your operation—and your relationship with a supplier—is to be brutally honest about what you need. If your application requires handling high-viscosity, shear-sensitive, abrasive, or multi-phase fluids, with a reasonable budget, I'd recommend a Netzsch pump. If you're dealing with extreme pressures, very high temperatures, or rock-bottom budgets, I'd recommend you look elsewhere.

And if you're ever in doubt, just ask. I'll tell you what I think. Sometimes the most helpful thing I can say is, "This probably isn't for you."

Prices and specifications as of January 2025; verify current offerings with your Netzsch representative.