On 2/25/2014 6:33 PM, DerbyDad03 wrote:
TimR wrote:
This is easy enough to check, but you needed to do it right away.

Fill a glass of water and set it on the slab.

If it's vibrating you'll see ripples, little concentric circles.

If you don't see any, it's you.



Actually I looked at the water in the toilet. It was calm.