Try using bal micro grouts....
BAL Microcolour Wall Grout
A fast setting, efflorescence free, water and frost resistant cementitious grout with water repellent properties and built in Microban® antibacterial protection to inhibit the growth of bacteria and black mould. Suitable for use with ceramic tiles, porcelain, marble, natural stone, glass and fully vitrified tiles with joint widths from 1-7mm in interior and exterior locations including power showers.
BS EN 13888 CG2F Grout.
- Set in 5 hours
- 12 colours available
- Water repellent
- Anti-bacterial
Coverage : 400x300x10mm tile 3mm joint = 0.25kg/m2
Powder/ Water Ratio : 4 : 1
Joint Width : 1 -7 mm
Specific Gravity :1.40 g/cm3
Pot Life : 40 minutes
Cure : @ 20°C 5 hours
Packaging : 2.5kg & 10kg*
Colour : Brilliant White, Champagne, Pebble*,
Gunmetal, Smoke*, Straw, Saffron, Denim, Scarlet, Emerald, Chocolate* &
Ebony*. (* Limited colours available in 10kgs).Temperature Resistance -30°C to 150°C
And as for the wash boys BOTH are good makes......i have the BAL one.....