Why BBB Method?

[CarlD]

If what you are doing is working for you, then it's working for you. We all have to compromise somewhere to ensure our pool is maintained the way we like it.

But it is a fact that evaporation will not reduce CYA. Splash-out and backwashing can, though.

The bottom line is it is your pool and you make all the decisions about it. We simply make suggestions based on what has worked for us and thousands like us.

If by whatever means you control CYA so you are happy with it, then, by all means, keep using pucks.

But I once went away for two weeks and left 4 floaters in my pool full of pucks. When I came back, my pool was clean as a whistle--algae free, my FC was up, but my CYA had gone from 30 to 60, and my pH was below 6.8--took 4 boxes of Borax to get it back up. It was then I learned that pucks are also EXTREMELY acid.

[waterbear]

IF you don't have a cartridge filter or a non backwashing DE filter.
IF you have a short swim season and winterize your pool (which means a partial drain, usually)
THEN using pucks in a feeder usually does not present problems with CYA getting too high too quickly.

IF you have a cartridge or non backwashing DE filter, an extended swim season, and live in a climate where you don't have to winterize your pool (or any combination of the above) then, IMHO, using pucks will lead to elevated CYA levels before the swim seaon is over and you might find that you have outbreaks of algae a few months into it (Could there be cause and effect why most Mustard Algae outbreaks are seen around August?)

Just my 2 cents!