You may need more pomegranates/oranges. What you require is equal quantities of juice from each fruit. For me this recipe produced approx 400ml of each

Cut Pomegranates in half

Place a large mixing bowl into an empty sink

NOTE: this splashes and pomegranate juice stains, so make sure you have cleared away anything that you cannot wipe down, and wear an apron!

Hold pomegranate over the bowl, seeds facing bowl and hit the skin with the back of a heavy spoon. This causes the seeds to fall into bowl. Repeat with all 3 Pomegranates.

Once pomegranates are deseeded, remove any stray lumps/bits of pith.

Place into blender for 10 seconds

Strain juice into bowl.

Measure quantity, then Pour juice into serving jug.

Squeeze oranges

Pour juice into serving jug.

Add sparkling water to taste, then serve