A tiny drop of washing-up liquid in a bucket of water to dunk dried-out potted plants in helps with re-wetting if it's needed. But to answer the original question, I've never noticed a bag of compost that said on it whether there was a wetting agent used or not. Maybe it's in teeny tiny small print somewhere. All the ones I've ever used can be hard to re-wet if they get completely dried out (either in the bag or in a plant pot) so if they did contain a wetting agent, the effect wasn't noticeable to me.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
I recommend Melcourt Sylvagrow peat-free compost. It is not sold in many places around here unfortunately but the RHS garden centres have a special offer on it so I stocked up at Bridgewater. It is a Which? best buy. No mention of a wetting agent on the bag but then I can't remember seeing it on any bag.
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I live in west central Scotland - not where that photo is...
https://www.growfruitandveg.co.uk/grapevine/forum/on-the-plot/vegging-out/6061-contains-a-wetting-agent
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I live in west central Scotland - not where that photo is...
it helps when trying to water containers that have previously dried out.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.