Roughly, I have to replace my water heater elements every 10 months without adding salt for my salt softener. Sounds like this type of products can only make it every 10.5 month or something like that. Not much usage for me?
What your doing is polarizing your water with an electro magnet adding two back to back is kinda redundant. when you heat things they depolorizes. The second coil should go after your hot water heater.
The directions state that you need a second if your runs are more than 50 feet because after 50 feet the water returns to its original state. So far I see no need for a second one. Thanks for watching!