[cute fuzzy bunny]

Quote:

Originally Posted by wallygador69 Wouldn't a single rester in the hot and one in the cold supply lines in the attic protect the entire house?

To a degree. In a perfect world, you have an arrestor at each solenoid/high speed valve, as close to the valve as possible. For example, these washing machine ones should be connected to the washer rather than the washers valves. The further away the arrestor is from the 'problem' valve, the longer the reaction time to stop the water hammer. A central arrestor is a decent compromise but not quite ideal.

Washing machines, dishwashers, some toilet valves, and irrigation valve solenoids are usually the evil-doers.

Nords...I have a whole house carbon and grit filter yet oddly I still get some fine grained sandy stuff in my inlet baskets. When I replaced the washing machine lines yesterday the hot water inlet basket was JAMMED full of fine grain whitish/tan colored sand. Nothing in the cold. I moved that water heater 2.5 years ago and it was clean then. Methinks some of this is mineral sediment formed in the water heater, after the filter. Or maybe some sort of buildup in the pipes, probably at a low point or a joint, that periodically lets go.

Should be interesting to keep an eye on going forward. The new WH i put in had a swirly inlet that allegedly self cleans the unit continuously rather than letting the sediment build up in the bottom of the WH. If that works, I should get more crud in the hot water inlets, and in all inlets that combine water.