Water 'Hammering' issue

Singleminded wrote:
I promised to update....Amazon did it's usual....received the water hammer arrester same day....!

In hindsight, I should have done this in two stages, but....I bled the water lines on the exterior shower unit andand installed the arrester.....Hammering is gone!

I did have some air spitting when I bled the cold water line, so I suspect that was the culprit....but still puzzled as to why none of the other water outlets caused hammering when flowing?

Another wonderful mystery of life!

My guess would be that when filling your toilet bowl after flushing you are barely pressing down to allow water to flow in. On your other faucets you probably open them normally. When ever I encountered hammering it always occurred at very low flows once faucets was opened up the hammering went away.