Thx Vinny.
They look to technical. I just ideally want somethiing I can attach to the skimmer, push a button and it stops running for 30 mins. I can't tell how those relay things work if I just plug the skimmer in and set a time, push a button and I have a delay of 30 mins.
I'm thkining this timer:
https://www.amazon.com/Fosmon-Outdoo...3357576&sr=8-7
But it's not 'on demand' button for 30 min delay. I"d have to feed every day at same time, which isn't horrible either