[brad1138]

I have recently become aware of WTL, I am thinking of a Amadeus Jr.

But over time the fluid the Golf ball sits in will get dust in it, do you need to replace the fluid every so often?

[VinceT]

I bought mine used and changed the fluid, I just keep it covered when I am not using it to keep the dust out of it. To my understanding that fluid lasts a long time.

[mick wolfe]

I've had the original Amadeus for over a decade. I've never had issue with dust collecting in the vat and have never changed the fluid. My system is in a bedroom more or less isolated from the rest of the house, so it only sees activity when I listen. IOW, a low traffic area. I do cover the Amadeus when not in use with a of very light transparent plastic bag.