As of Mekanism 9.7.0 it is now possible to view all recipe strings of the Electrolytic Separator through the command /ct mekrecipes separator

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mods.mekanism.separator.addRecipe(ILiquidStack inputFluid, double inputRF, IGasStack outputGas1, IGasStack outputGas2);

mods.mekanism.separator.addRecipe(<liquid:liquidfusionfuel>, 5000, <gas:deuterium>, <gas:tritium>);

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mods.mekanism.separator.removeRecipe(IIngredient inputFluid, @Optional IIngredient outputGas1, @Optional IIngredient outputGas2);

mods.mekanism.separator.removeRecipe(<liquid:heavywater>, <gas:deuterium>, <gas:oxygen>);
mods.mekanism.separator.removeRecipe(<liquid:water>);

Specifying an output parameter will only remove the specific recipe that results in that output from that input. Omitting the output parameter will remove all recipes that the input item can produce.

As of Mekanism 9.7.0 it is now possible to remove all Electrolytic Separator recipes. (This excludes any recipes added via CraftTweaker)

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mods.mekanism.separator.removeAllRecipes();