There is a sign in Tesco saying Soap Dispenser Pumps are in short supply

[KittenVsBox]

Buying liquid handsoap for the kids to use when washing their hands. There was a sign with the soap saying the dispenser pumps were in short supply, and requesting we save ours.
What do I do with a soap dispenser pump once I have one in the next few days?? All the bottles of soap had their own pump as the lid, and I'm guessing they wont want us to post them back. Any clues??

Or is this going to be like the CIF adverts where they say you can reuse the old bottle, but the concentrated stuff to top them up never gets this far north???

We’ve been saving ours for weeks as we heard this a while back, got four saved and bought some different soaps with non pump lids last week and just decanted them into the pump bottles, will use shower gel etc as well if there’s no liquid hand soap in the shops, all works the same anyway.

Bar soap forms scum because it's based on long chain fatty acids, which react with hard water. Liquid soap is based on SLS, which doesn't.