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filling a 25 x 25mm trench in slab

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Just wondering what people do when they've need to cut a small trench in a concrete slab to run some conduit in it ?

Do you fill it with just cement or use something more specialised like floor leveller ?

The floor will be tiled over the top in the end, so it won't need to look pretty.
Grab a bag of mortar mix from the hardware, it doesn't need anything fancy.
Thanks mgilla, I thought that's all I might need, but thought I better double check to be sure.
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