Which is better: laundry powder or liquid? Do laundry ...- non biological washing powder washing soap dispenser ,For years I swore powder was best but I think that was price driven as now I like liquid capsules for convenience and for keeping the washer drawer clean. Got a bit lazy now I can afford a big better. The difference is between biological and non biological.Amazon.co.uk: non bio washing powderPersil Family Size Non-Bio Washing Powder - 130 Washes - Laundry Cleaning Detergent - Cleans Tough Stains Even in a Quick Wash. 4.5 out of 5 stars 129 £19.97 £ 19 . 97 (£2.38/kg)