I stand corrected! And thank you! So...using the cart for 2 years means...what? How are they not running into the problems of not having the copper/silver killing algae the second season?

You got me backwards on the other post.

I said it's easier to convert biguanide to chlorine than bromine, meaning bromine is MUCH harder to convert to chlorine than biguanide, not from biguanide to bromine (who would do that????)

I KNEW there was a reason bromine worked better in hot tubs--I thought it was the bather load and the fact the few hot tubs are run in the sunshine.