Pool has been looking good. pH is up around 7.6 and FC is around 4......I found a liquid shock @ BJ's which is like a Costco or Sam's club if you've never heard of before. They have a case which consists of 4 one gal containers of liquid shock. 12% sodium hypo-chloride. The case is $12.99 which is about the same price I'd pay for bleach @ 6%. So is this stuff good and I just use a lesser quantity when raising the FC? And I guess finally with these #'s how often should i anticipate adding more.