Everbuild Opti-Mix Mortar Plasticiser - 1 Litre Tested to BS EN 934 - part 3. Description Opti-mix mortar plasticiser is the world's first 1:25 plasticiser is just pure admix, smells and works like the best traditional admix. Benefits include superior plasticising actions, controlled dosage, consistent mix design, easy to use and no waste. 1 litre is equivalent to 25 litres of standard product and 250ml is equivalent to 6.25 litres of standard product. Application Shake bottle well before use. Push the lid downwards and twist anti-clockwise to remove. Squeeze the sides of the bottle to fill the measuring cup to the required dose - 5 to 10ml per 50kg of cement. Add opti-mix to a bucket of water and stir/mix well use up to a maximum 10 litres of water. Dry mix all other ingredients and add sufficient quantities of water/opti-mix solution until the desired consistency is achieved. Never add opti-mix directly to the dry mix, always let down into a portion of guaging water. Replace cap after use. Storage Store in original unopened containers between 5 and 40C. Shelf life 12 months from date of manufacture.