Improved! Contains SpotBlok stain repellent. Even better stain protection than before. To add stain protection every time you clean! Cleans, beautifies, deodorizes & protects. Super-concentrate cleans up to twice as much carpet as other brands. Removes allergens like pollen and dust. Proven effective on all carpets meant for hot-water extraction cleaning, including stain resistant carpets. Rug Doctor Carpet Cleaner - For use in all deep-cleaning/hot water extraction carpet cleaning machines. Cleans, beautifies, deodorizes and protects your carpet. Deep cleans up to twice the area of other brands - 450-900 sq ft (2 to 4 average size rooms). Maximum phosphorous content upon dilution: less than 0.015%.