After fighting algae problems since Hurricane Katrina I have finally decide to give in and switch over to the BBB method after poaching on this site for the last year. It was the uncanningly accurate depictions of others experience with their local pool store that finally convinced me to switch. It seems they all read from the same script. My pool is about 90K gallons so I will need a little over 170 lbs of boric acid to bring it up to 40 ppm. I have located a chemical supply company that will sell boric acid in 50lb bags for $.85 per lb. Considering I will need little if any acid to balance the ph with the boric acid as opposed to the borax, this seems like the less expensive alternative. Anything I should watch out for? Also I seem to recall a link that listed boric acid for $.69 per lb but forgot to capture the link and now can't relocate it.