OK. 2.5 gallons @ 10% in 11,000 of pool water => 25 ppm chlorine.

Dude! You are *already* running pretty much BBB, or rather, following the "Best Guess" guide.

BBB means different things to different people, but I guess, since it's was my idea (CarlD's *name* but my idea) I can define it and pretty much claim that that is the OFFICIAL meaning.

A lot of folks focus on the ingredients -- bleach, borax, baking soda -- which is reasonable enough, since those often ARE key ingredients. But for me, it was always about the best, easiest, cheapest way. Bleach has fewer side effects than other forms of chlorine, and USED TO BE cheaper. But, I've used bleach, trichlor, diclor, cal hypo and chlorine gas.

BBB is really about using what you need, only what you need, and only when you need it.

You do need to find out where your stabilizer really is -- 25 ppm is OK with 100 ppm, but is marginally low with 200 ppm. If you don't want to test it yourself, and if P-a-P is doing accurate testing, just take in a sample of your pool water, diluted 50:50 with *DISTILLED* water (from Walmart) and then double their CYA reading.

If it's 100, you're probably fine. If it's 200, you probably want to go to 3.5 gallons of bleach + 1 gallon midway during the interval and skip the trichlor, till it drops.

BTW, your domain name has expired, and your PoolForum account will go dead when the mail forwarding drops. So, you probably either want to rescue your domain, or change the email address in your PF profile.