Ecozone BIOActive limescale and dirt preventor protects washing machines from limescale, rust, dirt and odour. Bleach Free with biodegradable ingredients. Expands machine life time. Pour the product into the washing machine dispenser drawer with your usual laundry detergent. You can use the minimum dosage of regular detergent in soft water dosage. Use in every cycle. Dosing instructions 50 ml medium to hard water, 100 ml very hard water