The Melter is a type of IRecipeManager and implements all the methods that are available to IRecipeManager's, such as removeRecipe() and removeAll().

The following script will add a recipe that will output a 222Mb of Water (Fluid) when a Stick and Dirt is Melted.

ZenScript
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// <recipetype:cyclic:melter>.addRecipe(String name, IIngredient inputFirst, IIngredient inputSecond, IFluidStack fluidStack)

<recipetype:cyclic:melter>.addRecipe("ct_water", <item:minecraft:stick>, <item:minecraft:dirt>, <fluid:minecraft:water> * 222);

The following script will remove the Melting recipe for water from 2 Snow Blocks

ZenScript
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// <recipetype:cyclic:melter>.removeRecipe(String name);

<recipetype:cyclic:melter>.removeRecipe("cyclic:melter_snowwater");