ronb wroteYes you can arrange tests - but one test is a waste of time, you need frequent tests (weekly?). The costs add up so that in the end gallons may be cheaper. I don't know about Pureit, but purchased systems have no guarantees. A filter system is good until it leaks - but how do you know when that is? UV systems are Ok when they work well - but how do you know?
Good luck working it out.
Bearing in mind the country we live in and its endemic problems, ie pervasive corruption , who is to say the gallons are pure ?