How to Build an Affordable Soft Wash System From Scratch
Building your own soft wash system doesn't have to cost a fortune. With the right components and a little know-how, contractors can put together a fully functional, professional-grade soft wash rig at a fraction of the cost of pre-built systems. Whether you're just starting out or looking to add a second rig without blowing your budget, this guide walks you through every component, every decision, and every dollar.
What Is a Soft Wash System?
A soft wash system uses low pressure — typically under 500 PSI — combined with high-concentration cleaning chemicals to safely clean surfaces like roofs, siding, stucco, wood fences, and more. Unlike high-pressure washing, soft washing eliminates the risk of surface damage while delivering superior results on organic growth like algae, mold, mildew, and lichen. For contractors, adding soft washing to your service menu is one of the highest-margin moves you can make.
Why Build Instead of Buy?
Pre-built soft wash systems can run $1,500 to $4,000+. When you build your own, you control every component, you know exactly what's in your rig, and you can replace or upgrade individual parts without scrapping the whole system. You'll also develop a deeper understanding of how your equipment works — which means faster troubleshooting on the job.
Core Components You Need
1. 12V Soft Wash Pump
The heart of your system. A 12V diaphragm pump is the most affordable and reliable entry point for soft washing. Browse our Soft-Wash Machines collection for options that balance cost and performance for professional use.
2. Chemical Tank
A 35-100 gallon poly tank works great for most trailer or truck-bed rigs. Source locally from a farm supply store to avoid freight costs. Make sure it's rated for sodium hypochlorite.
3. Soft Wash Hose
Standard pressure washing hose degrades quickly when exposed to SH. Our Softwash Hose Roll 200 ft x 5/8 in 300 PSI 150 DEG Blue is purpose-built for soft wash applications and gives you plenty of reach for residential and commercial jobs.
4. Spray Gun
Choose a gun rated for your pump's GPM output. Browse our Spray Guns collection — including the ST-2305 Safety Orange Gun 12GPM 5000PSI and the Gladiator G1 Spray Gun 7 GPM 4000 PSI.
5. Nozzles
Soft wash nozzles are designed for low-pressure, high-volume flow. Check out our full Nozzles collection to find the right tip for your pump and application.
6. Chemical Injector
Browse our Chemical Injectors collection — including the GP Fixed Injector 3-5gpm and GP Fixed Injector 2-3gpm for reliable downstream dosing.
7. Fittings, Ball Valves and Quick Connects
Use our Quick Connect Fittings, Ball Valves, and Swivels to build a tight, professional system.
8. Hose Reel
A hose reel keeps your rig organized and extends hose life. Browse our Hose Reels collection for affordable options.
Estimated Budget Build Cost
- 12V pump: $150-$300
- Chemical tank 35-100 gal: $80-$200
- Soft wash hose 200 ft: $60-$120
- Spray gun: $40-$100
- Nozzles: $20-$50
- Injector: $20-$40
- Fittings, ball valves, quick connects: $40-$80
- Hose reel: $60-$150
- Total estimated cost: $470-$1,040 vs $1,500-$4,000+ for pre-built systems
Step-by-Step Assembly Tips
- Mount your tank securely — weight shifts dramatically when full
- Run your suction line from the tank bottom with a ball valve shutoff
- Connect pump inlet to suction line with chemical-rated fittings
- Run discharge line from pump to hose reel inlet
- Connect soft wash hose to reel outlet
- Attach spray gun and nozzle at the end
- Wire your pump to a dedicated 12V battery with an inline fuse
- Test with water before running chemicals
Pro Tips for Keeping Costs Down
- Buy components individually rather than kits — bundling always carries a premium
- Source your tank locally to avoid heavy freight charges
- Use our Parts collection for O-rings, seals, and replacement components
- Start with a smaller tank and upgrade as your volume grows
- Keep a spare pump on the truck — downtime costs more than the pump
Final Thoughts
A DIY soft wash system built from quality affordable components can save you $800-$2,000 upfront and give you complete control over your rig. Start with our Soft-Wash Machines, add the right soft wash hose, and build out from there. Your margins will thank you.