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Comet P40 Softwash Skid — Honda GX160-200
From
$2,099.00
A Comet P-40 softwash skid system powered by a Honda GX160-200 engine, rated to a maximum 11 GPM at a maximum 300 PSI. Select your configuration from the dropdown.
Softwash is a different discipline than pressure washing. Instead of using pressure to blast contamination off a surface, it applies cleaning solution at high volume and low pressure and lets the chemistry do the work. That's what makes it the correct method for asphalt shingle roofs, painted siding, and stucco — substrates that high pressure would damage — and it's why softwash systems use diaphragm pumps rated around 300 PSI rather than the 3000+ PSI triplex pumps on surface cleaning rigs.
At 11 GPM this unit moves the volume that determines softwash productivity. Flow rate, not pressure, sets how much roof or siding you can treat per hour, so a high-GPM system translates directly into more jobs completed per day.
The Comet P-40 is the most widely used diaphragm pump in professional roof cleaning, and its parts availability reflects that. Diaphragms, valve kits, manifolds, and seals are all stocked service items rather than special orders — which matters enormously on a pump that handles sodium hypochlorite every working day.
Flush with fresh water after every chemical use. It takes a few minutes and meaningfully extends the life of diaphragms, valves, and seals. This single habit is the biggest factor in how long a softwash pump lasts.
Frequently Asked Questions
What are the output specs? Maximum 11 GPM at maximum 300 PSI — high flow, low pressure for softwash applications.
Why is the pressure so low? Softwash relies on chemical dwell time and volume. High pressure damages roofs, siding, and painted surfaces.
Can this be used for pressure washing? No. This is a low-pressure diaphragm system. Pressure washing requires a triplex pump.
Are replacement parts available? Yes — Comet P-40 diaphragms, valve kits, manifolds, and seals are all stocked service items.
How do I make the pump last longer? Flush with fresh water after every chemical use. It's the single biggest factor in softwash pump service life.
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