Caught a sale on 10% chlorine at 2.29 gallon but I'm getting low and will be purchasing more soon. The normal price for the 10% is 4.29 per gallon. I have been buying 12.5% at the local pool store but it has risen to 7.30 per gallon. For the amount of usable chlorine per gallon is the 10% still a better deal??? I liked buying at the pool store since its only minutes away but the prices went up. The other store is a hardware store but carries some pool products and can order the chlorine for me and have it in 2-3 days. It is only 10 more minutes away... Whatcha say on the better deal?? THANKS!