When the toilet is flushed a thump or clunk of the water is made and very little water is returned to the bowl. A gurgle sound is made from the vanity sink; however, no back up is noticed. Water is returned to the normal height after a short time (15-20 minutes). Is this something I should be concerned with or is this due to the low water pressure also being experienced when showering? Thanks, J

How long does the toilet run before it is satisfied? The gurgling and the thunking is possibly unrelated, but the gurgling suggests a sluggish or backed up drain.