Brave Search summarizer gives this information for anyone who wants to start their own Sweet Potato Slips:
Chlorine in tap water can inhibit or prevent sweet potato slips from sprouting. Multiple sources confirm that high levels of chlorine, commonly found in city water, can damage or kill sweet potato tubers, leading to rot instead of sprouting.
A gardener on 5 Acres & A Dream discovered that her sweet potatoes rotted in tap water but successfully sprouted when transferred to filtered water, concluding that chlorine was the likely culprit.
KelseyViews and Johnny's Farm both recommend using filtered water over tap water, as chlorine and other chemicals can harm developing slips.
To safely use tap water, let it sit for 24 hours to allow chlorine to dissipate, though filtered water remains the preferred option. If your sweet potatoes aren’t sprouting in water, consider switching to filtered or de-chlorinated water.
Sweet Potatoes playlist from Deep South Homestead - 79 videos including several on slips - https://www.youtube.com/playlist?list=PLfy5IxZ1NtN9BZuuHCJ3oBKkn4DTQEkes