• 2025-07-22

Car wash and stain-free rinse water treatment

Reverse Osmosis (RO) Pure Water System

Using 0.0001 micron composite membrane for deep desalination, the dissolved solid removal rate is ＞90% (typical working conditions), and the conductivity of produced water is ＜50 μS/cm. The system can effectively eliminate water stains and extend the life cycle of car washing equipment (design service life is 15-20 years). The core advantages include:

Eliminate calcium and magnesium deposition and avoid white spots on the paint surface

Increase the activity of detergents (interfacial tension is reduced by 40%)

Reduce the labor cost of the drying process

The scaling rate of heat exchange equipment is reduced by 80%

Softener ion exchange system

Replace calcium and magnesium ions through sodium resin (exchange capacity ≥2.0 eq/L), and the hardness of the outlet water is ＜1 mg/L. Applicable to:

Anti-stain treatment in the final rinsing process

Detergent efficiency enhancement (soap liquid consumption is reduced by 30%)

Boiler/heating tube anti-scaling protection

Need to cooperate with periodic salt regeneration (cycle 72-96 hours), the main life of the equipment is about 10 years.

Impact of water quality issues on car wash business

Contaminant types Equipment damage Increased operating costs

Calcium and magnesium ions Nozzle blockage (flow attenuation > 50%) Descaling agent consumption increased by 3 times

Dissolved solids Paint corrosion (when TDS > 500ppm) Rework rate increased by 40%

Colloid particles High-pressure pump seal failure Filter element replacement frequency reduced to 1 month/time

System selection technical decision points

Water source characteristics

When groundwater hardness > 150 mg/L, water softener is preferred

When municipal water TDS > 300 ppm, RO system needs to be activated

Process requirements

RO water must be used for contactless car wash (conductivity < 20 μS/cm)

Soft water hardness < 17 is recommended for final rinsing process mg/L

Economic model

RO system water saving rate> 60% (concentrated water can be reused for pre-washing)

Water softener reduces heat energy consumption by 12% (heat exchange efficiency is improved)

Full-cycle operation benefits

RO system: investment recovery within 3 years (reducing 2 drying personnel/station)

Soft water system: protect boiler and extend service life to 10 years (harder water conditions)

Comprehensive solution reduces water consumption per vehicle by 35% (in line with GB/T 18920 recycled water standard)