I have had my 400 gallon spa for almost a year and thankfully switched to the Dichlor/Bleach method after my disastrous first fill which turned out much like the friend above. My water has never been cleaner or safer. I can't imagine ever switching from this. As for the tester the Taylor Kit is good, but there is also another TFT Test Kit - TFT Test Kits which although a little more expensive at start up provides more tests, especially CYA, for your money. I have had my kit almost 9 months and I am just getting to need CYA test and Chlorine (FAS/DPD) refills. I will never, ever use strips again except for maybe testing salt (unstabilized chlorine adds salt). Do what you want, but I will tell you I am much happier - no Ph drift, no scaling, no irritation/rash.