There are two solutions to your problem:
The simplest and least expensive solution would be to replumb both toilets to use pressurized flush water as they were design to do and add 4 tablespoons (2 coffee measure spoons) of solar salt to each flush. I've known a number of people who keep a big Rubbermaid box of salt in the head to do it this way 'cuz they either don't have room or don't want to spend the money to add a salt tank. Or, if that's too much effort...
1. Replumb the toilets to use pressurized fresh water as they're designed to do and add a salt feed tank--either this one
4 gallon salt feed tank owners manual or this one
4 gal salt feed tank w pump owners manual, depending on which is the right one for your toilet..I'm 90% certain it's the one WITH PUMP but it's Saturday so I can't call Raritan to ask 'em. You can give 'em a call on Monday to find out: 800-352-5630
Solar salt is recommended because it dissolves much faster than table salt. It's available from most big box hardware stores. Inexpensive and a 10 lb bag lasts several months.
Either way has to be easier than cleaning out the flush water intake system with muriatic acid every couple of weeks.
--Peggie
"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein