..........YOUR WATER HEATER.
I spent three hours on Saturday draining and flushing what looked like aquarium sand and gravel out of my water heater. It had been making knocking and popping noises for months, even after draining it. I tried turning on the water in short bursts to stir up the crud, which helped, but still it made noise. There's actually a tool for this. I probably flushed 10lbs of calcuim and crap out of there. I never saw completely clean water come out, even after hours of water on/off/air/drain and repeat...so I'll do it again soon. If I hadn't waited so many years it probably wouldn't have taken hours to do.
https://www.amazon.com/Sediment-Bus...cphy=9030456&hvtargid=pla-2281435180738&psc=1
I spent three hours on Saturday draining and flushing what looked like aquarium sand and gravel out of my water heater. It had been making knocking and popping noises for months, even after draining it. I tried turning on the water in short bursts to stir up the crud, which helped, but still it made noise. There's actually a tool for this. I probably flushed 10lbs of calcuim and crap out of there. I never saw completely clean water come out, even after hours of water on/off/air/drain and repeat...so I'll do it again soon. If I hadn't waited so many years it probably wouldn't have taken hours to do.
https://www.amazon.com/Sediment-Bus...cphy=9030456&hvtargid=pla-2281435180738&psc=1