I had used Tri-Chlor pucks in my Pentair feeder for 2 1/2 years until last year.

I decided to give the BBB a try. What I found was that for my pool (about 22,000 gallon Vinyl IG) that I had to add about 96oz (3/4 of a gallon) of bleach each day to keep my levels where they needed to be (about 1ppm of Cl by the end of the day, bumping to about 3 - 3.5 ppm after adding the bleach).

It only takes a second to add the bleach - but I just didn't like the hassle of having to remember to do it every day (I get lots of sun on my pool - from about 9am - 8pm during the peak of the summer).

I didn't have any problems with this method, except I almost never had to use the Borax - but instead ended up having to use either dry acid, or muratic acid to adjust my pH instead.

The other thing that I didn't like was all the bottles. For me the cheapest option for bleach was the 3/4 gallon (96oz) Walmart Ultra (6%) bleach for $0.78. As a result I had between 5 and 7 empty plastic bottles a week that I had to haul to the recycler ever few weeks.

Another draw back - this year - that same $0.78 bottle of bleach is now $1.28, making the cost over $1.70 / gallon, and the larger bottles work out about the same. I don't have any local sources for bulk bleach.

I'll have to keep an eye on my CYA this year - but it's so low starting the season I should be OK - and if it gets out of check, I can slow the feeder down, and supplement a few times a week with bleach to keep it in contol.

The pH should be more balanced this way as well.

To each his own - and maybe someday I'll go SWG, but for now - the Pentair Rainbow online feeder will do the trick.

Good luck - and test often