Magnetic descaler do they work???? Yes.👌👍 

I installed this magnetic descaler about 13 years ago and a hot water heater as well.
I never replaced any anode ever since but the hat water tank still works fine.
The only reason to replace it is for upgrading to the tankless hot water tank.
The tank should have been replaced a long time ago. That is to prove the magnetic descaler works very well.
If anyone has a hard water scalar problem, then make this then install it to any main water pipes in your house.
It is not a short term solution but a long term solution.