Because you asked, here's the site:
Magnetic Water Conditioners- Trentatrons-The alternative to salt based water softeners
I can't say anything other than the product worked for me. Whether they actually honor the 90 return policy I won't find out.
I should add that I've ordered and Monday installed two more of these. Whether they give me any additional benefit will take some time to tell. I've mentioned that we have a limited well and are "off grid" for power. I have a "cistern" system: a 1000 gal tank that I pump 250 gallons into every 4th day, using my generator (this also 'excercises' my generator) because it's so deep that to power that pump with inverters is too expensive. I have a dedicated inverter that powers a jet pump that supplies the two bladder pressure tanks from the 'cistern'.
I've added a magnet to the pipe from the well to the cistern. I added another to the in/out of the bladder tanks. Tonight will be the first time I've pumped into the cistern since adding that magnet. I can't say that I've seen a noticable difference because of the magnet on the pipe from the bladder tanks, but our water at the house already seems "soft" so I don't know if we'll notice anything else.
What benefits could I see? I'm not exactly sure but after that initial surprise it was worth another $140 (woulda been less if I'd ordered all 4 at once, dang). Our evaporative coolers will now get "magnatized" water (they tap off before the house supply). The water in the 100 gal tank will eventually be "magnatized".
It's (hopefully) about the end of the cooler season. Will this make the air coming out better? Will the water in the tank show some change? Will our water in the house be "softer" yet? Tune in next year and I may know some answers.
In the meantime I originally intended to only post about the changes that I have no doubt about.
Phil