Ristow RV Macerator Pump 12V 12 GPM — Compact Self-Priming Sewage Pump, Stainless Blades & Thermal Protection

The Ristow RV Macerator Pump is a 12V, 12 GPM self-priming sewage pump that quickly grinds and moves waste for fast, reliable RV holding-tank emptying.

This compact macerator kit pairs a high-speed copper motor with stainless steel cutting blades to reduce solids and evaculate gray/blackwater efficiently. Designed for mobile use, it delivers up to 12 gallons per minute (45 LPM) and includes the fittings and power leads needed for straightforward installation and occasional on-road operation. The unit's thermal protection and run-dry safeguards help avoid motor damage during intermittent use, while its self-priming ability and 10 ft lift make it suitable for common RV dumping scenarios.

How fast will the Ristow macerator empty my RV holding tank?

The pump moves up to 12 GPM (45 LPM), so a typical 150 L tank can be emptied in about five minutes under normal conditions. Flow depends on hose length, vertical lift, and tank contents.

• Flow rate: 12 GPM / 45 LPM
• Typical 150 L tank: roughly 5 minutes to empty
• Lift capacity: up to 10 ft vertical
• Performance varies with hose diameter and clogs

What does the macerator do to solid waste and what should I avoid?

The macerator uses four stainless steel spiral blades to chop solids down to about 1/8 inch (4 mm) so they can pass through hoses and fittings. It is effective for typical toilet waste and toilet paper but not intended for large, hard objects.

• Cutting size: reduces solids to ~4 mm
• Blade material: stainless steel for corrosion resistance
• Not recommended for sanitary napkins, rags, or hard debris
• Periodic inspection prevents blockages

How is the pump powered and what safety features are included?

The unit runs on 12V DC and comes with a cigarette lighter cable plus alligator clips for battery hook-up, allowing flexible installation and portable use. The motor has thermal overload protection and run-dry sensing to reduce risk of damage from overheating or lack of fluid.

• Power: 12V DC, cigarette-lighter and alligator clip leads included
• Motor: 100% copper for efficient operation and heat dissipation
• Protections: thermal shutoff and run-dry protection
• Intermittent duty cycle recommended for longevity

What comes in the Ristow macerator pump kit and is installation difficult?

The kit arrives ready to connect with a macerator pump, valve connector for fresh water port, hose fittings, power leads, transparent hose, clamps, and a user manual. Most RV owners can install the unit with basic tools; follow the included instructions for secure hose clamps and correct electrical connections.

• Included: pump, on/off valve connector, 7.6 ft cigarette cable
• Also included: 1.3 ft alligator cables, GHT hose connector, 10" transparent hose
• Extras: two hose clamps and user manual for guidance
• Installation: basic plumbing and 12V wiring skills required

Who is this for: The Ristow 12V macerator pump suits RV owners, camper van travelers, and boaters who need a portable, efficient solution for dumping holding tanks faster and farther than gravity alone allows. It's aimed at users who want a compact kit with reliable cutting blades, straightforward hookups, and safety features that protect the motor during intermittent use. Avoid heavy-duty industrial uses or pumping fluids with inappropriate debris; this product is optimized for typical RV waste and routine tank maintenance.