Case Study: Home Care Detergent Hard Water Performance

Client challenge

• Liquid laundry soil removal dropped sharply at 300 ppm hardness in internal panels
• Hand dishwash flash foam collapsed in hard water vs soft-water TV demo standards
• Clear liquids hazed when builders were raised without hydrotrope adjustment
• Regional return rate ~1.8% vs ~0.9% national average
• Marketing hardness claims could not be substantiated with current chassis

Solution provided

1. Surfactant chassis

• Raised optimized nonionic share against primary anionic for oily soil + hardness resilience
• Retained anionic level needed for consumer foam storytelling on dishwash
• Screened ethoxylate cloud behaviour for cold-water laundry claims

2. Clarity & builders

• Hydrotrope adjusted for electrolyte + fragrance load
• Chelant / builder treat rates matched to labelled hardness guidance
• Order-of-addition SOP updated to avoid local precipitation

3. Validation

• Wash panels at 150 / 300 / 450 ppm hardness
• Dishwash foam height in hard water vs soft baseline
• Freeze–thaw and 45°C clarity on aged batches

Implementation

• Phase 1: Lab DOE on anionic–nonionic ratios (2 weeks)
• Phase 2: Pilot plant batches + stability (3 weeks)
• Phase 3: Soft launch in two hard-water regions (8 weeks)
• Phase 4: National formula lock and dual-source bridging

Results & benefits

• Cleaning: ~25–30% better hard-water soil removal vs prior chassis at 300 ppm (panel method)
• Foam: Dishwash hard-water flash foam within ~10% of soft-water baseline
• Clarity: Warehouse haze complaints largely eliminated after hydrotrope retune
• Returns: Target-region returns down ~40% over two quarters (illustrative)
• Cost: Actives cost +3–4%; net margin improved after lower returns and fewer reformulation cycles

Client testimonial

Key success factors

• Hard-water tests as stage-gates, not afterthoughts
• System view: surfactants + builders + hydrotrope together
• Separate optimization paths for laundry vs dishwash foam goals

Conclusion

Hard-water detergent performance is engineered—not hoped for. Pair this case with the home-care surfactant systems application note and detergent formulation how-to, then engage Esteem Industries for chassis trials matched to your hardness claims.