Water hammer I have a 100ft well, in which I recently replaced the pump.

All of my faucets now knock, but in a strange way. Instead of knocking when the water is turned off, they knock when the water is turned on (about 3 seconds later). The knock seems to be coming from about 3-4 ft from the tap in each case, but I can't pinpoint it further. The knock is not related to the pump cycling or to the water pressure (system is set for 40/60 and that is what it's performing at). After a given faucet knocks once, you can't make it repeat. Knocks for faucets, toilets, washing, machine. I would install a knock arrestor, if I knew where to put it Any advice would be appreciated.

 

Same for hot and cold?

Does it occur for toilet flushes?

 

Did the knock noise start immediately when the pump was replaced or several weeks later? Here is a recent post, it might be the source of your problem. Turn off the water at each faucet and toilet, especially any shower and tube. Check for noise and if none, turn on each fixture one at a time.

https://terrylove.com/forums/index.php?threads/water-hammer-recently-in-shower.82769/#post-596947