Have a very small intex 12'x30" vinyl pool that's 1,400 gallons. Have my ph down to 7.3-7.4 but my total chlorine seems to be at about 1 and won't budge. I'm using 1" slow dissolving tablets and they don't seem to work so I'm going to switch to bleach. How much bleach do I need to get up to the recommended level of total chlorine for my pool? Just want to make sure I'm keeping my pool sanitized good enough.