Assuming the liquid is water...
Using intense 254nm UV will break ozone down without any chemical feed.
Ozone has a strong affinity for H2S, blue dyes, metals that are not fully oxidized, and any compound with carbon-carbon double bonds (aromatics).
Ozone survives just a few millimeters into either diatomaceous earth, multi-media sand, or granular carbon filters. Caution: ozone will convert
manganese to permanganate ion, which is water soluble and can be a whole different problem.
Heating the water and / or raising the water's pH above 8 will cause the ozone to decay more rapidly.
Waiting 24 hours will let the ozone decay without doing anything more.
Blowing air through the water will strip the ozone from the water, and place most of it in the air stream leaving the water.
Liquid ozone will spontaneously "deflagrate" to oxygen gas plus heat if you treat it less than gently. Think of a not very slow *boom*.
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