Great, I appreciate your opinions. We saw some very compelling sales messages from Clearwater Blue, which of course sounded appealing, but once we began digging for reviews we lost confidence in that menthod. Going the bromine route is absolutely what we are encouraged to do first by everyone, so it seems like that'll be our strategy starting out. Trying it will give us a good look at bromine, and maybe it won't seem that scary after all.
Waterbear: What the store rep did tell us about the frog also, was that without the Spa Frog I ought to maintain 2-4ppm. of bromine in my water, but with it I could go down to 0.5ppm. I saw another post where you mentioned that 2ppm is really too low. Do you think it's safe to drop the bromine level if a frog is introduced into the system?
Though of course this isn't my opinion for community/public spas, but at home we actively try to avoid an anti-bacterial environment. Yes, of course I clean (and would use an antibacterial cleaner if I were to, say, put a raw fish on the counter) but I don't wash my hands with antibacterical products, etc. I believe it's unhealthy to completely sterilize my environment. I'm sure you've heard this brand of snake-oil before, but my folks are chemists, and these perspectives have been in my family since I was a child. With the spa, assuming I do larger cleanings regularly (drain/scrub/refill) how important is it to keep this completely sterile (vs. dropping to a low bromine level like the 0.5-2pmm). I'm not used to dealing with 300 gallons of water hanging out in a bucket for 2-3 months, and I'm content to admit it's quite different from using antibacterial soap to wash my hands.