True: The most important thing about mixing is ensuring the correct amounts are in each mix., Incorrect mixing could lead to the mortar or concrete being the wrong strength or colour., Mixing can be done by hand or mixer, 4:1 is used underground , 5:1 is used on facing bricks, 6:1 is used on softer facing bricks or thermolite blocks, Mortar is made of fine aggregate and portland cement, The consistency is dependent on the weather, materials and bricklayer, Additives are added as per manufacturers instructions, False: Mixing is only done in a bucket, Mortar must be mixed in a silo, 3:1 is used on thermolite blocks, Mortar is made of coarse aggregate and lime, The 1 in the mix is referring to water, Plasticiser is a frost proofer,

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