we have three bathrooms in the house. when the one in the middle of the house fills up after flushing, it makes a roaring sound. what can be done to stop this.
A simple inexpensive fix may to install a new valve in the toilet tank that's giving you problems. Fluidmaster (name brand) is less then $10.00. Look for one that say's anti-siphon.
PlumbingSupply.US has just about any toilet part you may need. Check out the website and the price for a Fluidmaster will surprise you. They have a world-class technical support hotline to help you.